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Wave interference

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104: 274: 5457:'s double slit interferometer in 1803 demonstrated interference fringes when two small holes were illuminated by light from another small hole which was illuminated by sunlight. Young was able to estimate the wavelength of different colours in the spectrum from the spacing of the fringes. The experiment played a major role in the general acceptance of the wave theory of light. In quantum mechanics, this experiment is considered to demonstrate the inseparability of the wave and particle natures of light and other quantum particles ( 3245: 237: 1422: 2196: 1430: 5530: 3269: 6917: 5578:. This technique works by superposing (interfering) the signal waves from the different telescopes on the principle that waves that coincide with the same phase will add to each other while two waves that have opposite phases will cancel each other out. This creates a combined telescope that is equivalent in resolution (though not in sensitivity) to a single antenna whose diameter is equal to the spacing of the antennas farthest apart in the array. 3160:
period will give rise to an interference pattern while they overlap. Two identical waves which consist of a narrow spectrum of frequency waves of finite duration (but shorter than their coherence time), will give a series of fringe patterns of slightly differing spacings, and provided the spread of spacings is significantly less than the average fringe spacing, a fringe pattern will again be observed during the time when the two waves overlap.
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amplitudes—this is known as destructive interference. In ideal mediums (water, air are almost ideal) energy is always conserved, at points of destructive interference, the wave amplitudes cancel each other out, and the energy is redistributed to other areas. For example, when two pebbles are dropped in a pond, a pattern is observable; but eventually waves continue, and only when they reach the shore is the energy absorbed away from the medium.
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the wavelength decreases and the summed intensity will show three to four fringes of varying colour. Young describes this very elegantly in his discussion of two slit interference. Since white light fringes are obtained only when the two waves have travelled equal distances from the light source, they can be very useful in interferometry, as they allow the zero path difference fringe to be identified.
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the sum of the displacements of the individual waves. At some points, these will be in phase, and will produce a maximum displacement. In other places, the waves will be in anti-phase, and there will be no net displacement at these points. Thus, parts of the surface will be stationary—these are seen in the figure above and to the right as stationary blue-green lines radiating from the centre.
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Conventional light sources emit waves of differing frequencies and at different times from different points in the source. If the light is split into two waves and then re-combined, each individual light wave may generate an interference pattern with its other half, but the individual fringe patterns
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as the sounds alternately interfere constructively and destructively. As the two tones gradually approach unison, the beating slows down and may become so slow as to be imperceptible. As the two tones get further apart, their beat frequency starts to approach the range of human pitch perception, the
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It is also possible to observe interference fringes using white light. A white light fringe pattern can be considered to be made up of a 'spectrum' of fringe patterns each of slightly different spacing. If all the fringe patterns are in phase in the centre, then the fringes will increase in size as
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have emission lines with quite narrow frequency spectra. When these are spatially and colour filtered, and then split into two waves, they can be superimposed to generate interference fringes. All interferometry prior to the invention of the laser was done using such sources and had a wide range of
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Consider, for example, what happens when two identical stones are dropped into a still pool of water at different locations. Each stone generates a circular wave propagating outwards from the point where the stone was dropped. When the two waves overlap, the net displacement at a particular point is
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Quantum mechanically the theories of Paul Dirac and Richard Feynman offer a more modern approach. Dirac showed that every quanta or photon of light acts on its own which he famously stated as "every photon interferes with itself". Richard Feynman showed that by evaluating a path integral where all
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The discussion above assumes that the waves which interfere with one another are monochromatic, i.e. have a single frequency—this requires that they are infinite in time. This is not, however, either practical or necessary. Two identical waves of finite duration whose frequency is fixed over that
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on a reflective surface. Light rays from a monochromatic source pass through the glass and reflect off both the bottom surface of the flat and the supporting surface. The tiny gap between the surfaces means the two reflected rays have different path lengths. In addition the ray reflected from the
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system was defined to be equal to 1,650,763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum. This definition was replaced in 1983 by defining the metre as the distance travelled by light in vacuum during a specific time interval.
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Normally, a single laser beam is used in interferometry, though interference has been observed using two independent lasers whose frequencies were sufficiently matched to satisfy the phase requirements. This has also been observed for widefield interference between two incoherent laser sources.
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generally approximates much more closely to a monochromatic source, and thus it is much more straightforward to generate interference fringes using a laser. The ease with which interference fringes can be observed with a laser beam can sometimes cause problems in that stray reflections may give
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of a wave meets a crest of another wave of the same frequency at the same point, then the amplitude is the sum of the individual amplitudes—this is constructive interference. If a crest of one wave meets a trough of another wave, then the amplitude is equal to the difference in the individual
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Interference of light is a unique phenomenon in that we can never observe superposition of the EM field directly as we can, for example, in water. Superposition in the EM field is an assumed phenomenon and necessary to explain how two light beams pass through each other and continue on their
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produces a spherical wave. If the light from two point sources overlaps, the interference pattern maps out the way in which the phase difference between the two waves varies in space. This depends on the wavelength and on the separation of the point sources. The figure to the right shows
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was developed. Astronomical radio interferometers usually consist either of arrays of parabolic dishes or two-dimensional arrays of omni-directional antennas. All of the telescopes in the array are widely separated and are usually connected together using
3235:. For example, the colours seen in a soap bubble arise from interference of light reflecting off the front and back surfaces of the thin soap film. Depending on the thickness of the film, different colours interfere constructively and destructively. 3142:
to give rise to interference fringes since it is not possible for waves of different polarizations to cancel one another out or add together. Instead, when waves of different polarization are added together, they give rise to a wave of a different
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possible paths are considered, that a number of higher probability paths will emerge. In thin films for example, film thickness which is not a multiple of light wavelength will not allow the quanta to traverse, only reflection is possible.
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of an optical interference pattern. The intensity of the light at a given point is proportional to the square of the average amplitude of the wave. This can be expressed mathematically as follows. The displacement of the two waves at a point
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To generate interference fringes, light from the source has to be divided into two waves which then have to be re-combined. Traditionally, interferometers have been classified as either amplitude-division or wavefront-division systems.
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Photograph of 1.5cm x 1cm region of soap film under white light. Varying film thickness and viewing geometry determine which colours undergo constructive or destructive interference. Small bubbles significantly affect surrounding film
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Constructive interference occurs when the waves are in phase, and destructive interference when they are half a cycle out of phase. Thus, an interference fringe pattern is produced, where the separation of the maxima is
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of the same frequency intersect at an angle. One wave is travelling horizontally, and the other is travelling downwards at an angle θ to the first wave. Assuming that the two waves are in phase at the point
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Real wave interference is obtained simply by adding the displacements from equilibrium (or amplitudes) of the two waves; In complex wave interference, we measure the modulus of the wavefunction squared.
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where the path difference is an even multiple of λ/2 the waves cancel. Since the gap between the surfaces varies slightly in width at different points, a series of alternating bright and dark bands,
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can be considered to be a multiple-beam interferometer; since the peaks which it produces are generated by interference between the light transmitted by each of the elements in the grating; see
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Because the frequency of light waves (~10 Hz) is too high for currently available detectors to detect the variation of the electric field of the light, it is possible to observe only the
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It is sometimes desirable for several waves of the same frequency and amplitude to sum to zero (that is, interfere destructively, cancel). This is the principle behind, for example,
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will present a peculiar effect: when the two tones are close in pitch but not identical, the difference in frequency generates the beating. The volume varies like in a
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creates ultrasonic waves that are radiated into the medium. The waves strike a reflector placed parallel to the crystal, reflected back to the source and measured.
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Interferometry has played an important role in the advancement of physics, and also has a wide range of applications in physical and engineering measurement.
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generated will have different phases and spacings, and normally no overall fringe pattern will be observable. However, single-element light sources, such as
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When the plane of observation is far enough away, the fringe pattern will be a series of almost straight lines, since the waves will then be almost planar.
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interference between two spherical waves. The wavelength increases from top to bottom, and the distance between the sources increases from left to right.
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Thus, the interference pattern maps out the difference in phase between the two waves, with maxima occurring when the phase difference is a multiple of 2
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indicates that the object can be in situation A or situation B. The above equation can then be interpreted as: The probability of finding the object at
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Interference occurs when several waves are added together provided that the phase differences between them remain constant over the observation time.
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is used to divide the light into two beams travelling in different directions, which are then superimposed to produce the interference pattern. The
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This represents a wave at the original frequency, traveling to the right like its components, whose amplitude is proportional to the cosine of
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was fond of saying that all of quantum mechanics can be gleaned from carefully thinking through the implications of this single experiment.
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line in the new standard, and also showed that it could be used as a length standard. Sixty years later, in 1960, the metre in the new
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It is easy to see that a set of waves will cancel if they have the same amplitude and their phases are spaced equally in angle. Using
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The above can be demonstrated in one dimension by deriving the formula for the sum of two waves. The equation for the amplitude of a
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of the wave. Suppose a second wave of the same frequency and amplitude but with a different phase is also traveling to the right
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in the above equation depending on whether the quantum interference term is positive or negative. If this term is absent for all
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Interference of right traveling (green) and left traveling (blue) waves in Two-dimensional space, resulting in final (red) wave
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function. A classical wave at any point can be positive or negative; the quantum probability function is non-negative.
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above, the quantum interference term can add (constructive interference) or subtract (destructive interference) from
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On the mechanism of the eye / by Thomas Young.; Young, Thomas; University College, London Library Services (1801).
5352:. The interference pattern occurs on the far side, observed by detectors suitable to the particles originating the 3483: 1370: 972:{\displaystyle W_{1}+W_{2}=2A\cos \left({\varphi \over 2}\right)\cos \left(kx-\omega t+{\varphi \over 2}\right).} 254: 6852: 6561: 6556: 6279: 5469: 5384: 4141: 3590: 3570: 3438: 3210: 5431:, as the beat frequency of any two tones is equivalent to the frequency of their implied fundamental frequency. 6864: 6536: 3830: 3560: 3144: 2078: 257:
states that when two or more propagating waves of the same type are incident on the same point, the resultant
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function representing the displacement from an equilibrium position; an optical or quantum wavefunction is a
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Optical interference between two point sources that have different wavelengths and separations of sources.
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to interfere. In practice this means the wave must come from the same source and have similar frequencies
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Cropped tomography scan animation of laser light interference passing through two pinholes (side edges).
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The fringes are observed wherever the two waves overlap and the fringe spacing is uniform throughout.
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instruments that can produce sustained tones, beats can be readily recognized. Tuning two tones to a
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from electrons, atoms or molecules approach a barrier with two slits in it. One slit becomes
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The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory
2164:. Some of the differences between real valued and complex valued wave interference include: 6847: 6776: 6721: 6451: 6274: 6232: 5926: 5882: 5843: 5762: 5623: 5603: 5487:. When the metre was defined as the distance between two marks on a platinum-iridium bar, 3835: 3747: 3473: 3430: 3139: 2168:
The interference involves different types of mathematical functions: A classical wave is a
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are combined by adding their intensities or displacements with due consideration for their
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where the path difference is an odd multiple of λ/2, the waves reinforce. At locations
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In addition to classical wave model for understanding optical interference, quantum
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when it is in situation B plus an extra term. This extra term, which is called the
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which means "hit or strike", and was used in the context of wave superposition by
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are generally considered to be the first strong evidence against the theory of a
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Any two different real waves in the same medium interfere; complex waves must be
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Pfleegor, R. L.; Mandel, L. (1967). "Interference of independent photon beams".
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is an instrument for measuring the physical characteristics of sound waves in a
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correspond to distinct situations A and B. When this is the case, the equation
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is known as the fringe spacing. The fringe spacing increases with increase in
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This can be expressed in terms of the intensities of the individual waves as
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Bach, Roger; Pope, Damian; Liou, Sy-Hwang; Batelaan, Herman (2013-03-13).
294:(180°), whereas destructive interference occurs when the difference is an 6677: 5895: 5720: 5638: 5508: 5501: 5353: 5265: 4165: 4069: 4024: 3959: 3914: 3289: 3228: 3216:
In wavefront-division systems, the wave is divided in space—examples are
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bottom plate undergoes a 180° phase reversal. As a result, at locations
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when it is in situation A plus the probability of finding the object at
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respective paths. Prime examples of light interference are the famous
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Easy JavaScript Simulation Model of One Dimensional Wave Interference
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and Benoît used interferometry to measure the wavelength of the red
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is produced. This combination tone can also be referred to as a
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can be directly observed: they are real-valued wave functions;
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one merely assumes the converse, then multiplies both sides by
1991:{\displaystyle \varphi _{n}-\varphi _{n-1}={\frac {2\pi }{N}}.} 1810: 619: 37:"Interference pattern" redirects here. For Moiré patterns, see 4373:{\displaystyle P(x)=|\Psi (x,t)|^{2}=\Psi ^{*}(x,t)\Psi (x,t)} 2457:{\displaystyle U_{2}(\mathbf {r} ,t)=A_{2}(\mathbf {r} )e^{i}} 2344:{\displaystyle U_{1}(\mathbf {r} ,t)=A_{1}(\mathbf {r} )e^{i}} 6034:
This is Your Brain on Music: The Science of a Human Obsession
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Interference can also be seen in everyday phenomena such as
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Patel, R.; Achamfuo-Yeboah, S.; Light R.; Clark M. (2014).
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spurious interference fringes which can result in errors.
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Interferometry has been used in defining and calibrating
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A simple form of interference pattern is obtained if two
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Interferometry is still fundamental in establishing the
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Phenomenon resulting from the superposition of two waves
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Geometrical arrangement for two plane wave interference
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The best known example of quantum interference is the
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cannot be directly observed: they are complex valued
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It can be seen that the two waves are in phase when
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may be too technical for most readers to understand
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If a 184:as well as in loudspeakers as electrical waves. 5961:, The Feynman Lectures Website, September 2013. 5916: 5914: 1433:Interference fringes in overlapping plane waves 1223:{\displaystyle W_{1}+W_{2}=2A\cos(kx-\omega t)} 1147:{\displaystyle \left|\cos(\varphi /2)\right|=1} 5833: 2470:represents the magnitude of the displacement, 1766: 30:For interference in radio communications, see 6155: 5977:"Controlled double-slit electron diffraction" 5963:"The Feynman Lectures on Physics, Volume III" 5507:Interferometry is used in the calibration of 4142: 3138:Classically the two waves must have the same 618:is the phase difference between the waves in 413:{\displaystyle W_{1}(x,t)=A\cos(kx-\omega t)} 336: 232:Interference of waves from two point sources. 5911: 4955:is the probability of finding the object at 3370: 3344: 3239:Iridiscence caused by thin-film interference 3213:are examples of amplitude-division systems. 3154: 2190: 1446:, then the relative phase changes along the 6128:Flash animations demonstrating interference 6050: 5423:beating starts to sound like a note, and a 6162: 6148: 6113:Expressions of position and fringe spacing 5581: 4215:for a quantum mechanical object. Then the 4149: 4135: 3274:White light interference in a soap bubble. 1416: 282:Constructive interference occurs when the 5992: 5930:. Cambridge: Cambridge University Press. 5894: 5813:. Cambridge: Cambridge University Press. 5440: 4169: 2751: 1450:-axis. The phase difference at the point 1356: 1297: 1287: 1280: 1270: 91:Learn how and when to remove this message 75:, without removing the technical details. 5920: 5528: 2485:The displacement of the summed waves is 2194: 2113:{\displaystyle e^{i{\frac {2\pi }{N}}}.} 1770: 1428: 1420: 272: 235: 227: 219: 102: 6031: 5748:10.1093/gmo/9781561592630.article.20622 5518: 5511:(called gauge blocks in the US) and in 3279: 3192: 2199:Creation of interference fringes by an 1610:and are half a cycle out of phase when 43:Interference pattern (electromyography) 14: 6934: 6056: 5760: 1367:, so the sum of the two waves is zero 6169: 6143: 5808: 5735: 3250:Smartphone with iridescent back panel 626:and add: the sum of the two waves is 73:make it understandable to non-experts 5871:"Widefield two laser interferometry" 4247:of observing the object at position 1360:{\displaystyle \cos(\varphi /2)=0\,} 47: 3201:In an amplitude-division system, a 286:difference between the waves is an 255:principle of superposition of waves 24: 6066:. New York: W.W. Norton. pp.  5318: 5276: 5191: 5146: 5090: 5065: 5037: 5007: 4901: 4873: 4851: 4810: 4768: 4716: 4691: 4663: 4633: 4590: 4545: 4506: 4445: 4417: 4395: 4352: 4328: 4294: 4179: 3681:Sum-over-histories (path integral) 3367: 3341: 3297:Part of a series of articles about 3218:Young's double slit interferometer 1846:{\displaystyle Ae^{i\varphi _{n}}} 1813:, each wave can be represented as 1463: 25: 6958: 6101: 5129:in the above equation. As in the 3318: 1790: 6916: 6915: 3267: 3255: 3243: 3106: 3082: 3050: 3029: 3000: 2976: 2952: 2911: 2887: 2857: 2836: 2809: 2780: 2738: 2711: 2691: 2633: 2601: 2563: 2531: 2501: 2433: 2401: 2371: 2320: 2288: 2258: 470:{\displaystyle k=2\pi /\lambda } 333:also demonstrate interference. 52: 6092:Geometrical and Physical Optics 6084: 6025: 5359: 5130: 107:The interference of two waves. 6865:Relativistic quantum mechanics 5944: 5862: 5827: 5802: 5789: 5754: 5729: 5712: 5345:{\displaystyle \Psi _{B}(x,t)} 5339: 5327: 5303:{\displaystyle \Psi _{A}(x,t)} 5297: 5285: 5217: 5212: 5200: 5186: 5172: 5167: 5155: 5141: 5116: 5104: 5086: 5074: 5058: 5046: 5033: 5021: 4922: 4910: 4894: 4882: 4866: 4854: 4837:{\displaystyle \Psi _{B}(x,t)} 4831: 4819: 4795:{\displaystyle \Psi _{A}(x,t)} 4789: 4777: 4745: 4742: 4730: 4712: 4700: 4684: 4672: 4659: 4647: 4629: 4616: 4611: 4599: 4585: 4571: 4566: 4554: 4540: 4526: 4521: 4509: 4502: 4495: 4489: 4466: 4454: 4438: 4426: 4410: 4398: 4367: 4355: 4349: 4337: 4314: 4309: 4297: 4290: 4283: 4277: 4234: 4228: 4194: 4182: 3831:Relativistic quantum mechanics 3363: 3356: 3337: 3113: 3110: 3102: 3086: 3078: 3065: 3054: 3046: 3033: 3025: 3004: 2996: 2980: 2972: 2956: 2948: 2918: 2915: 2907: 2891: 2883: 2870: 2861: 2853: 2840: 2832: 2813: 2805: 2784: 2776: 2748: 2734: 2721: 2707: 2695: 2687: 2669:The intensity of the light at 2649: 2637: 2629: 2616: 2605: 2597: 2579: 2567: 2559: 2546: 2535: 2527: 2511: 2497: 2449: 2437: 2429: 2416: 2405: 2397: 2381: 2367: 2336: 2324: 2316: 2303: 2292: 2284: 2268: 2254: 1347: 1333: 1217: 1199: 1130: 1116: 737:{\displaystyle W_{1}+W_{2}=A.} 728: 725: 701: 689: 671: 662: 585: 561: 546: 534: 506:{\displaystyle \omega =2\pi f} 407: 389: 374: 362: 261:at that point is equal to the 13: 1: 6843:Quantum statistical mechanics 6620:Quantum differential calculus 6542:Delayed-choice quantum eraser 6325:Symmetry in quantum mechanics 6003:10.1088/1367-2630/15/3/033018 5987:(3). IOP Publishing: 033018. 5705: 5513:coordinate-measuring machines 5504:chain in length measurement. 3871:Quantum statistical mechanics 2141:Complex valued wave functions 1406:{\displaystyle W_{1}+W_{2}=0} 215: 135:is a phenomenon in which two 5694:Rayleigh roughness criterion 5553:In 1946, a technique called 2135:interference vs. diffraction 1756:, and with decreasing angle 748:for the sum of two cosines: 187: 41:. For the medical term, see 32:Interference (communication) 7: 6645:Quantum stochastic calculus 6635:Quantum measurement problem 6557:Mach–Zehnder interferometer 6032:Levitin, Daniel J. (2006). 5616: 5555:astronomical interferometry 5525:Astronomical interferometer 5470:Michelson–Morley experiment 5399:as a periodic variation in 3841:Quantum information science 3211:Mach–Zehnder interferometer 1767:Between two spherical waves 113:(constructive interference) 10: 6963: 5736:Jones, Peter Ward (2001). 5522: 5444: 5433: 5368: 4200:{\displaystyle \Psi (x,t)} 3283: 2124:Fabry–PĂ©rot interferometer 1000:{\displaystyle \varphi /2} 337:Real-valued wave functions 204:which means "between" and 121:(destructive interference) 36: 29: 6911: 6873: 6825: 6705:Quantum complexity theory 6683:Quantum cellular automata 6658: 6590: 6524: 6437: 6401: 6388:Path integral formulation 6355: 6220: 6177: 6094:, 1968, Longmans, London. 5773:10.1007/978-3-0348-8652-9 5541:formed from many smaller 4997:quantum interference term 3173:successful applications. 3155:Light source requirements 2474:represents the phase and 2191:Optical wave interference 1012:Constructive interference 151:constructive interference 6772:Quantum machine learning 6752:Quantum key distribution 6742:Quantum image processing 6732:Quantum error correction 6582:Wheeler's delayed choice 5856:10.1103/physrev.159.1084 5722:Young, Thomas, 1773-1829 5649:Interference lithography 5407:of the two frequencies. 3876:Quantum machine learning 3629:Wheeler's delayed-choice 3207:Michelson interferometer 2137:for further discussion. 1233:Destructive interference 611:{\displaystyle \varphi } 320:anti-reflective coatings 157:destructive interference 18:Destructive interference 6688:Quantum finite automata 5739:Oxford University Press 5654:Interference visibility 5588:acoustic interferometer 5582:Acoustic interferometry 5364: 5310:and the other becomes 4166:wave-behavior of matter 3586:Leggett–Garg inequality 1417:Between two plane waves 440:is the peak amplitude, 6792:Quantum neural network 6036:. Dutton. p. 22. 5981:New Journal of Physics 5761:Kipnis, Nahum (1991). 5689:Thin-film interference 5674:Multipath interference 5550: 5447:Optical interferometry 5441:Optical interferometry 5391:of slightly different 5346: 5304: 5264:. In this experiment, 5262:double-slit experiment 5251: 5231: 5123: 4989: 4969: 4949: 4929: 4838: 4796: 4752: 4473: 4374: 4261: 4241: 4201: 3377: 3286:Double-slit experiment 3123: 2928: 2661: 2458: 2345: 2221: 2166: 2114: 2067: 2033: 1992: 1925: 1893: 1867: 1847: 1776: 1735: 1682: 1602: 1527: 1434: 1426: 1407: 1361: 1314: 1224: 1148: 1092: 1001: 973: 853: 746:trigonometric identity 738: 622:. The two waves will 612: 592: 507: 471: 434: 414: 312:double-slit experiment 279: 250: 233: 225: 154:) or lower amplitude ( 124: 6817:Quantum teleportation 6345:Wave–particle duality 5924:; Wolf, Emil (1999). 5809:Steel, W. H. (1986). 5539:interferometric array 5532: 5459:wave–particle duality 5347: 5305: 5252: 5232: 5124: 4990: 4970: 4950: 4930: 4839: 4797: 4753: 4474: 4375: 4262: 4242: 4202: 3571:Elitzur–Vaidman 3561:Davisson–Germer 3378: 3233:structural coloration 3124: 2929: 2662: 2459: 2346: 2198: 2115: 2068: 2007: 1993: 1926: 1924:{\displaystyle n=N-1} 1894: 1868: 1848: 1774: 1736: 1683: 1603: 1528: 1432: 1424: 1408: 1362: 1315: 1225: 1149: 1093: 1002: 974: 854: 739: 613: 593: 508: 472: 435: 415: 276: 248: 231: 223: 106: 6848:Quantum field theory 6777:Quantum metamaterial 6722:Quantum cryptography 6452:Consistent histories 5927:Principles of Optics 5896:10.1364/OE.22.027094 5624:Active noise control 5519:Radio interferometry 5387:pattern between two 5314: 5272: 5241: 5137: 5003: 4979: 4959: 4939: 4848: 4806: 4764: 4483: 4392: 4386:linear superposition 4271: 4251: 4240:{\displaystyle P(x)} 4222: 4213:Schrödinger equation 4176: 4170:optical interference 4162:Quantum interference 3836:Quantum field theory 3748:Consistent histories 3385:Schrödinger equation 3312: 3280:Quantum interference 3193:Optical arrangements 2942: 2681: 2491: 2354: 2241: 2218:interference fringes 2079: 2004: 1935: 1903: 1877: 1857: 1817: 1697: 1616: 1541: 1460: 1371: 1324: 1243: 1158: 1102: 1022: 983: 863: 859:this can be written 752: 630: 602: 521: 485: 444: 424: 349: 196:is derived from the 6833:Quantum fluctuation 6802:Quantum programming 6762:Quantum logic gates 6747:Quantum information 6727:Quantum electronics 6202:Classical mechanics 5887:2014OExpr..2227094P 5881:(22): 27094–27101. 5848:1967PhRv..159.1084P 5684:Optical path length 5634:Coherence (physics) 5570:, or other type of 5545:, like many larger 5474:luminiferous aether 5468:The results of the 5429:missing fundamental 5131:classical wave case 5103: 5020: 4729: 4646: 4382:complex conjugation 3624:Stern–Gerlach 3421:Classical mechanics 3170:mercury-vapor lamps 2804: 2775: 2131:diffraction grating 1892:{\displaystyle n=0} 1804:diffraction grating 174:surface water waves 6886:in popular culture 6668:Quantum algorithms 6516:Von Neumann–Wigner 6496:Objective collapse 6207:Old quantum theory 6133:2009-06-24 at the 5576:Aperture synthesis 5551: 5478:special relativity 5403:whose rate is the 5342: 5300: 5247: 5227: 5119: 5089: 5006: 4985: 4965: 4945: 4925: 4834: 4792: 4748: 4715: 4632: 4469: 4380:where * indicates 4370: 4257: 4237: 4197: 3812:Von Neumann–Wigner 3792:Objective-collapse 3591:Mach–Zehnder 3581:Leggett inequality 3576:Franck–Hertz 3426:Old quantum theory 3373: 3145:polarization state 3119: 2924: 2790: 2761: 2657: 2454: 2341: 2222: 2110: 2063: 1988: 1921: 1889: 1863: 1843: 1777: 1731: 1678: 1598: 1523: 1435: 1427: 1403: 1357: 1310: 1220: 1144: 1088: 997: 969: 849: 734: 608: 588: 503: 467: 430: 410: 280: 251: 234: 226: 125: 6929: 6928: 6903:Quantum mysticism 6881:Schrödinger's cat 6812:Quantum simulator 6782:Quantum metrology 6710:Quantum computing 6673:Quantum amplifier 6650:Quantum spacetime 6615:Quantum cosmology 6605:Quantum chemistry 6320:Scattering theory 6268:Zero-point energy 6263:Degenerate levels 6171:Quantum mechanics 6077:978-0-393-04688-5 5782:978-3-0348-9717-4 5644:Haidinger fringes 5572:transmission line 5250:{\displaystyle x} 4988:{\displaystyle x} 4968:{\displaystyle x} 4948:{\displaystyle x} 4260:{\displaystyle x} 4159: 4158: 3866:Scattering theory 3846:Quantum computing 3619:Schrödinger's cat 3551:Bell's inequality 3359: 3334: 3303:Quantum mechanics 3057: 2480:angular frequency 2103: 1983: 1866:{\displaystyle N} 1729: 1670: 1654: 1638: 1563: 1518: 1488: 959: 916: 840: 808: 515:angular frequency 433:{\displaystyle A} 246: 101: 100: 93: 16:(Redirected from 6954: 6919: 6918: 6630:Quantum geometry 6625:Quantum dynamics 6482:Superdeterminism 6378:Matrix mechanics 6233:Bra–ket notation 6164: 6157: 6150: 6141: 6140: 6095: 6088: 6082: 6081: 6054: 6048: 6047: 6029: 6023: 6022: 5996: 5972: 5966: 5965:(online edition) 5948: 5942: 5941: 5918: 5909: 5908: 5898: 5866: 5860: 5859: 5842:(5): 1084–1088. 5831: 5825: 5824: 5806: 5800: 5795:Ockenga, Wymke. 5793: 5787: 5786: 5758: 5752: 5751: 5733: 5727: 5726: 5716: 5629:Beat (acoustics) 5594:or liquid, such 5547:radio telescopes 5535:Very Large Array 5485:length standards 5476:and in favor of 5425:combination tone 5371:Beat (acoustics) 5351: 5349: 5348: 5343: 5326: 5325: 5309: 5307: 5306: 5301: 5284: 5283: 5256: 5254: 5253: 5248: 5236: 5234: 5233: 5228: 5226: 5225: 5220: 5199: 5198: 5189: 5181: 5180: 5175: 5154: 5153: 5144: 5128: 5126: 5125: 5120: 5102: 5097: 5073: 5072: 5045: 5044: 5019: 5014: 4994: 4992: 4991: 4986: 4974: 4972: 4971: 4966: 4954: 4952: 4951: 4946: 4934: 4932: 4931: 4926: 4909: 4908: 4881: 4880: 4843: 4841: 4840: 4835: 4818: 4817: 4801: 4799: 4798: 4793: 4776: 4775: 4757: 4755: 4754: 4749: 4728: 4723: 4699: 4698: 4671: 4670: 4645: 4640: 4625: 4624: 4619: 4598: 4597: 4588: 4580: 4579: 4574: 4553: 4552: 4543: 4535: 4534: 4529: 4505: 4478: 4476: 4475: 4470: 4453: 4452: 4425: 4424: 4379: 4377: 4376: 4371: 4336: 4335: 4323: 4322: 4317: 4293: 4266: 4264: 4263: 4258: 4246: 4244: 4243: 4238: 4211:solution of the 4206: 4204: 4203: 4198: 4151: 4144: 4137: 3778:Superdeterminism 3431:Bra–ket notation 3382: 3380: 3379: 3374: 3366: 3361: 3360: 3352: 3340: 3335: 3333: 3322: 3294: 3293: 3271: 3259: 3247: 3134: 3128: 3126: 3125: 3120: 3109: 3101: 3100: 3085: 3077: 3076: 3058: 3053: 3045: 3044: 3032: 3024: 3023: 3014: 3003: 2995: 2994: 2979: 2971: 2970: 2955: 2933: 2931: 2930: 2925: 2914: 2906: 2905: 2890: 2882: 2881: 2860: 2852: 2851: 2839: 2831: 2830: 2812: 2803: 2798: 2783: 2774: 2769: 2741: 2733: 2732: 2714: 2694: 2674: 2666: 2664: 2663: 2658: 2653: 2652: 2636: 2628: 2627: 2604: 2596: 2595: 2583: 2582: 2566: 2558: 2557: 2534: 2526: 2525: 2504: 2477: 2473: 2469: 2463: 2461: 2460: 2455: 2453: 2452: 2436: 2428: 2427: 2404: 2396: 2395: 2374: 2366: 2365: 2350: 2348: 2347: 2342: 2340: 2339: 2323: 2315: 2314: 2291: 2283: 2282: 2261: 2253: 2252: 2234: 2119: 2117: 2116: 2111: 2106: 2105: 2104: 2099: 2091: 2072: 2070: 2069: 2064: 2056: 2055: 2054: 2053: 2032: 2021: 1997: 1995: 1994: 1989: 1984: 1979: 1971: 1966: 1965: 1947: 1946: 1930: 1928: 1927: 1922: 1898: 1896: 1895: 1890: 1872: 1870: 1869: 1864: 1852: 1850: 1849: 1844: 1842: 1841: 1840: 1839: 1759: 1751: 1740: 1738: 1737: 1732: 1730: 1728: 1714: 1709: 1708: 1687: 1685: 1684: 1679: 1671: 1663: 1655: 1647: 1639: 1634: 1620: 1607: 1605: 1604: 1599: 1564: 1559: 1545: 1532: 1530: 1529: 1524: 1519: 1514: 1494: 1489: 1484: 1473: 1412: 1410: 1409: 1404: 1396: 1395: 1383: 1382: 1366: 1364: 1363: 1358: 1343: 1319: 1317: 1316: 1311: 1238: 1229: 1227: 1226: 1221: 1183: 1182: 1170: 1169: 1153: 1151: 1150: 1145: 1137: 1133: 1126: 1097: 1095: 1094: 1089: 1017: 1006: 1004: 1003: 998: 993: 978: 976: 975: 970: 965: 961: 960: 952: 921: 917: 909: 888: 887: 875: 874: 858: 856: 855: 850: 845: 841: 836: 825: 813: 809: 804: 793: 743: 741: 740: 735: 655: 654: 642: 641: 617: 615: 614: 609: 597: 595: 594: 589: 533: 532: 512: 510: 509: 504: 476: 474: 473: 468: 463: 439: 437: 436: 431: 419: 417: 416: 411: 361: 360: 301: 293: 247: 145:phase difference 96: 89: 85: 82: 76: 56: 55: 48: 21: 6962: 6961: 6957: 6956: 6955: 6953: 6952: 6951: 6932: 6931: 6930: 6925: 6907: 6893:Wigner's friend 6869: 6860:Quantum gravity 6821: 6807:Quantum sensing 6787:Quantum network 6767:Quantum machine 6737:Quantum imaging 6700:Quantum circuit 6695:Quantum channel 6654: 6600:Quantum biology 6586: 6562:Elitzur–Vaidman 6537:Davisson–Germer 6520: 6472:Hidden-variable 6462:de Broglie–Bohm 6439:Interpretations 6433: 6397: 6351: 6238:Complementarity 6216: 6173: 6168: 6135:Wayback Machine 6104: 6099: 6098: 6090:RS Longhurst, 6089: 6085: 6078: 6055: 6051: 6044: 6030: 6026: 5973: 5969: 5949: 5945: 5938: 5919: 5912: 5867: 5863: 5832: 5828: 5821: 5807: 5803: 5794: 5790: 5783: 5759: 5755: 5734: 5730: 5717: 5713: 5708: 5703: 5619: 5613: 5584: 5527: 5521: 5463:Richard Feynman 5449: 5443: 5438: 5373: 5367: 5362: 5321: 5317: 5315: 5312: 5311: 5279: 5275: 5273: 5270: 5269: 5242: 5239: 5238: 5221: 5216: 5215: 5194: 5190: 5185: 5176: 5171: 5170: 5149: 5145: 5140: 5138: 5135: 5134: 5098: 5093: 5068: 5064: 5040: 5036: 5015: 5010: 5004: 5001: 5000: 4980: 4977: 4976: 4960: 4957: 4956: 4940: 4937: 4936: 4904: 4900: 4876: 4872: 4849: 4846: 4845: 4813: 4809: 4807: 4804: 4803: 4771: 4767: 4765: 4762: 4761: 4724: 4719: 4694: 4690: 4666: 4662: 4641: 4636: 4620: 4615: 4614: 4593: 4589: 4584: 4575: 4570: 4569: 4548: 4544: 4539: 4530: 4525: 4524: 4501: 4484: 4481: 4480: 4448: 4444: 4420: 4416: 4393: 4390: 4389: 4331: 4327: 4318: 4313: 4312: 4289: 4272: 4269: 4268: 4252: 4249: 4248: 4223: 4220: 4219: 4177: 4174: 4173: 4164:– the observed 4155: 4126: 4125: 4124: 3889: 3881: 3880: 3826: 3825:Advanced topics 3818: 3817: 3816: 3768:Hidden-variable 3758:de Broglie–Bohm 3737: 3735:Interpretations 3727: 3726: 3725: 3695: 3687: 3686: 3685: 3643: 3635: 3634: 3633: 3600: 3556:CHSH inequality 3545: 3537: 3536: 3535: 3464:Complementarity 3458: 3450: 3449: 3448: 3416: 3387: 3362: 3351: 3350: 3336: 3326: 3321: 3313: 3310: 3309: 3292: 3282: 3275: 3272: 3263: 3260: 3251: 3248: 3195: 3157: 3132: 3105: 3096: 3092: 3081: 3072: 3068: 3049: 3040: 3036: 3028: 3019: 3015: 3013: 2999: 2990: 2986: 2975: 2966: 2962: 2951: 2943: 2940: 2939: 2910: 2901: 2897: 2886: 2877: 2873: 2856: 2847: 2843: 2835: 2826: 2822: 2808: 2799: 2794: 2779: 2770: 2765: 2737: 2728: 2724: 2710: 2690: 2682: 2679: 2678: 2670: 2632: 2623: 2619: 2612: 2608: 2600: 2591: 2587: 2562: 2553: 2549: 2542: 2538: 2530: 2521: 2517: 2500: 2492: 2489: 2488: 2478:represents the 2475: 2471: 2467: 2432: 2423: 2419: 2412: 2408: 2400: 2391: 2387: 2370: 2361: 2357: 2355: 2352: 2351: 2319: 2310: 2306: 2299: 2295: 2287: 2278: 2274: 2257: 2248: 2244: 2242: 2239: 2238: 2230: 2193: 2143: 2092: 2090: 2086: 2082: 2080: 2077: 2076: 2049: 2045: 2041: 2037: 2022: 2011: 2005: 2002: 2001: 1972: 1970: 1955: 1951: 1942: 1938: 1936: 1933: 1932: 1904: 1901: 1900: 1878: 1875: 1874: 1858: 1855: 1854: 1835: 1831: 1827: 1823: 1818: 1815: 1814: 1793: 1769: 1757: 1749: 1744: 1718: 1713: 1704: 1700: 1698: 1695: 1694: 1662: 1646: 1621: 1619: 1617: 1614: 1613: 1546: 1544: 1542: 1539: 1538: 1495: 1493: 1474: 1472: 1461: 1458: 1457: 1419: 1391: 1387: 1378: 1374: 1372: 1369: 1368: 1339: 1325: 1322: 1321: 1244: 1241: 1240: 1236: 1178: 1174: 1165: 1161: 1159: 1156: 1155: 1122: 1109: 1105: 1103: 1100: 1099: 1023: 1020: 1019: 1015: 989: 984: 981: 980: 951: 932: 928: 908: 904: 883: 879: 870: 866: 864: 861: 860: 826: 824: 820: 794: 792: 788: 753: 750: 749: 650: 646: 637: 633: 631: 628: 627: 603: 600: 599: 528: 524: 522: 519: 518: 486: 483: 482: 459: 445: 442: 441: 425: 422: 421: 356: 352: 350: 347: 346: 339: 324:interferometers 299: 291: 236: 218: 190: 97: 86: 80: 77: 69:help improve it 66: 57: 53: 46: 35: 28: 23: 22: 15: 12: 11: 5: 6960: 6950: 6949: 6947:Wave mechanics 6944: 6927: 6926: 6924: 6923: 6912: 6909: 6908: 6906: 6905: 6900: 6895: 6890: 6889: 6888: 6877: 6875: 6871: 6870: 6868: 6867: 6862: 6857: 6856: 6855: 6845: 6840: 6838:Casimir effect 6835: 6829: 6827: 6823: 6822: 6820: 6819: 6814: 6809: 6804: 6799: 6797:Quantum optics 6794: 6789: 6784: 6779: 6774: 6769: 6764: 6759: 6754: 6749: 6744: 6739: 6734: 6729: 6724: 6719: 6718: 6717: 6707: 6702: 6697: 6692: 6691: 6690: 6680: 6675: 6670: 6664: 6662: 6656: 6655: 6653: 6652: 6647: 6642: 6637: 6632: 6627: 6622: 6617: 6612: 6607: 6602: 6596: 6594: 6588: 6587: 6585: 6584: 6579: 6574: 6572:Quantum eraser 6569: 6564: 6559: 6554: 6549: 6544: 6539: 6534: 6528: 6526: 6522: 6521: 6519: 6518: 6513: 6508: 6503: 6498: 6493: 6488: 6487: 6486: 6485: 6484: 6469: 6464: 6459: 6454: 6449: 6443: 6441: 6435: 6434: 6432: 6431: 6426: 6421: 6416: 6411: 6405: 6403: 6399: 6398: 6396: 6395: 6390: 6385: 6380: 6375: 6370: 6365: 6359: 6357: 6353: 6352: 6350: 6349: 6348: 6347: 6342: 6332: 6327: 6322: 6317: 6312: 6307: 6302: 6297: 6292: 6287: 6282: 6277: 6272: 6271: 6270: 6265: 6260: 6255: 6245: 6243:Density matrix 6240: 6235: 6230: 6224: 6222: 6218: 6217: 6215: 6214: 6209: 6204: 6199: 6198: 6197: 6187: 6181: 6179: 6175: 6174: 6167: 6166: 6159: 6152: 6144: 6138: 6137: 6125: 6120: 6115: 6110: 6103: 6102:External links 6100: 6097: 6096: 6083: 6076: 6049: 6043:978-0525949695 6042: 6024: 5967: 5943: 5936: 5910: 5875:Optics Express 5861: 5826: 5819: 5811:Interferometry 5801: 5797:Phase contrast 5788: 5781: 5753: 5728: 5710: 5709: 5707: 5704: 5702: 5701: 5696: 5691: 5686: 5681: 5679:Newton's rings 5676: 5671: 5666: 5664:Lloyd's Mirror 5661: 5659:Interferometer 5656: 5651: 5646: 5641: 5636: 5631: 5626: 5620: 5618: 5615: 5606:. A vibrating 5598:, wavelength, 5583: 5580: 5523:Main article: 5520: 5517: 5445:Main article: 5442: 5439: 5436:Interferometry 5434:Main article: 5369:Main article: 5366: 5363: 5361: 5358: 5341: 5338: 5335: 5332: 5329: 5324: 5320: 5299: 5296: 5293: 5290: 5287: 5282: 5278: 5246: 5224: 5219: 5214: 5211: 5208: 5205: 5202: 5197: 5193: 5188: 5184: 5179: 5174: 5169: 5166: 5163: 5160: 5157: 5152: 5148: 5143: 5118: 5115: 5112: 5109: 5106: 5101: 5096: 5092: 5088: 5085: 5082: 5079: 5076: 5071: 5067: 5063: 5060: 5057: 5054: 5051: 5048: 5043: 5039: 5035: 5032: 5029: 5026: 5023: 5018: 5013: 5009: 4984: 4964: 4944: 4924: 4921: 4918: 4915: 4912: 4907: 4903: 4899: 4896: 4893: 4890: 4887: 4884: 4879: 4875: 4871: 4868: 4865: 4862: 4859: 4856: 4853: 4833: 4830: 4827: 4824: 4821: 4816: 4812: 4791: 4788: 4785: 4782: 4779: 4774: 4770: 4747: 4744: 4741: 4738: 4735: 4732: 4727: 4722: 4718: 4714: 4711: 4708: 4705: 4702: 4697: 4693: 4689: 4686: 4683: 4680: 4677: 4674: 4669: 4665: 4661: 4658: 4655: 4652: 4649: 4644: 4639: 4635: 4631: 4628: 4623: 4618: 4613: 4610: 4607: 4604: 4601: 4596: 4592: 4587: 4583: 4578: 4573: 4568: 4565: 4562: 4559: 4556: 4551: 4547: 4542: 4538: 4533: 4528: 4523: 4520: 4517: 4514: 4511: 4508: 4504: 4500: 4497: 4494: 4491: 4488: 4468: 4465: 4462: 4459: 4456: 4451: 4447: 4443: 4440: 4437: 4434: 4431: 4428: 4423: 4419: 4415: 4412: 4409: 4406: 4403: 4400: 4397: 4369: 4366: 4363: 4360: 4357: 4354: 4351: 4348: 4345: 4342: 4339: 4334: 4330: 4326: 4321: 4316: 4311: 4308: 4305: 4302: 4299: 4296: 4292: 4288: 4285: 4282: 4279: 4276: 4256: 4236: 4233: 4230: 4227: 4196: 4193: 4190: 4187: 4184: 4181: 4157: 4156: 4154: 4153: 4146: 4139: 4131: 4128: 4127: 4123: 4122: 4117: 4112: 4107: 4102: 4097: 4092: 4087: 4082: 4077: 4072: 4067: 4062: 4057: 4052: 4047: 4042: 4037: 4032: 4027: 4022: 4017: 4012: 4007: 4002: 3997: 3992: 3987: 3982: 3977: 3972: 3967: 3962: 3957: 3952: 3947: 3942: 3937: 3932: 3927: 3922: 3917: 3912: 3907: 3902: 3897: 3891: 3890: 3887: 3886: 3883: 3882: 3879: 3878: 3873: 3868: 3863: 3861:Density matrix 3858: 3853: 3848: 3843: 3838: 3833: 3827: 3824: 3823: 3820: 3819: 3815: 3814: 3809: 3804: 3799: 3794: 3789: 3784: 3783: 3782: 3781: 3780: 3765: 3760: 3755: 3750: 3745: 3739: 3738: 3733: 3732: 3729: 3728: 3724: 3723: 3718: 3713: 3708: 3703: 3697: 3696: 3693: 3692: 3689: 3688: 3684: 3683: 3678: 3673: 3668: 3663: 3658: 3652: 3651: 3650: 3644: 3641: 3640: 3637: 3636: 3632: 3631: 3626: 3621: 3615: 3614: 3613: 3612: 3611: 3609:Delayed-choice 3604:Quantum eraser 3599: 3598: 3593: 3588: 3583: 3578: 3573: 3568: 3563: 3558: 3553: 3547: 3546: 3543: 3542: 3539: 3538: 3534: 3533: 3532: 3531: 3521: 3516: 3511: 3506: 3501: 3496: 3494:Quantum number 3491: 3486: 3481: 3476: 3471: 3466: 3460: 3459: 3456: 3455: 3452: 3451: 3447: 3446: 3441: 3435: 3434: 3433: 3428: 3423: 3417: 3414: 3413: 3410: 3409: 3408: 3407: 3402: 3397: 3389: 3388: 3383: 3372: 3369: 3365: 3358: 3355: 3349: 3346: 3343: 3339: 3332: 3329: 3325: 3320: 3317: 3306: 3305: 3299: 3298: 3281: 3278: 3277: 3276: 3273: 3266: 3264: 3261: 3254: 3252: 3249: 3242: 3240: 3222:Lloyd's mirror 3194: 3191: 3156: 3153: 3118: 3115: 3112: 3108: 3104: 3099: 3095: 3091: 3088: 3084: 3080: 3075: 3071: 3067: 3064: 3061: 3056: 3052: 3048: 3043: 3039: 3035: 3031: 3027: 3022: 3018: 3012: 3009: 3006: 3002: 2998: 2993: 2989: 2985: 2982: 2978: 2974: 2969: 2965: 2961: 2958: 2954: 2950: 2947: 2923: 2920: 2917: 2913: 2909: 2904: 2900: 2896: 2893: 2889: 2885: 2880: 2876: 2872: 2869: 2866: 2863: 2859: 2855: 2850: 2846: 2842: 2838: 2834: 2829: 2825: 2821: 2818: 2815: 2811: 2807: 2802: 2797: 2793: 2789: 2786: 2782: 2778: 2773: 2768: 2764: 2760: 2757: 2754: 2750: 2747: 2744: 2740: 2736: 2731: 2727: 2723: 2720: 2717: 2713: 2709: 2706: 2703: 2700: 2697: 2693: 2689: 2686: 2656: 2651: 2648: 2645: 2642: 2639: 2635: 2631: 2626: 2622: 2618: 2615: 2611: 2607: 2603: 2599: 2594: 2590: 2586: 2581: 2578: 2575: 2572: 2569: 2565: 2561: 2556: 2552: 2548: 2545: 2541: 2537: 2533: 2529: 2524: 2520: 2516: 2513: 2510: 2507: 2503: 2499: 2496: 2451: 2448: 2445: 2442: 2439: 2435: 2431: 2426: 2422: 2418: 2415: 2411: 2407: 2403: 2399: 2394: 2390: 2386: 2383: 2380: 2377: 2373: 2369: 2364: 2360: 2338: 2335: 2332: 2329: 2326: 2322: 2318: 2313: 2309: 2305: 2302: 2298: 2294: 2290: 2286: 2281: 2277: 2273: 2270: 2267: 2264: 2260: 2256: 2251: 2247: 2192: 2189: 2188: 2187: 2184: 2177: 2162:wave functions 2142: 2139: 2109: 2102: 2098: 2095: 2089: 2085: 2062: 2059: 2052: 2048: 2044: 2040: 2036: 2031: 2028: 2025: 2020: 2017: 2014: 2010: 1987: 1982: 1978: 1975: 1969: 1964: 1961: 1958: 1954: 1950: 1945: 1941: 1920: 1917: 1914: 1911: 1908: 1888: 1885: 1882: 1862: 1838: 1834: 1830: 1826: 1822: 1792: 1791:Multiple beams 1789: 1768: 1765: 1747: 1727: 1724: 1721: 1717: 1712: 1707: 1703: 1677: 1674: 1669: 1666: 1661: 1658: 1653: 1650: 1645: 1642: 1637: 1633: 1630: 1627: 1624: 1597: 1594: 1591: 1588: 1585: 1582: 1579: 1576: 1573: 1570: 1567: 1562: 1558: 1555: 1552: 1549: 1522: 1517: 1513: 1510: 1507: 1504: 1501: 1498: 1492: 1487: 1483: 1480: 1477: 1471: 1468: 1465: 1418: 1415: 1414: 1413: 1402: 1399: 1394: 1390: 1386: 1381: 1377: 1355: 1352: 1349: 1346: 1342: 1338: 1335: 1332: 1329: 1309: 1306: 1303: 1300: 1296: 1293: 1290: 1286: 1283: 1279: 1276: 1273: 1269: 1266: 1263: 1260: 1257: 1254: 1251: 1248: 1230: 1219: 1216: 1213: 1210: 1207: 1204: 1201: 1198: 1195: 1192: 1189: 1186: 1181: 1177: 1173: 1168: 1164: 1143: 1140: 1136: 1132: 1129: 1125: 1121: 1118: 1115: 1112: 1108: 1087: 1084: 1081: 1078: 1075: 1072: 1069: 1066: 1063: 1060: 1057: 1054: 1051: 1048: 1045: 1042: 1039: 1036: 1033: 1030: 1027: 996: 992: 988: 968: 964: 958: 955: 950: 947: 944: 941: 938: 935: 931: 927: 924: 920: 915: 912: 907: 903: 900: 897: 894: 891: 886: 882: 878: 873: 869: 848: 844: 839: 835: 832: 829: 823: 819: 816: 812: 807: 803: 800: 797: 791: 787: 784: 781: 778: 775: 772: 769: 766: 763: 760: 757: 733: 730: 727: 724: 721: 718: 715: 712: 709: 706: 703: 700: 697: 694: 691: 688: 685: 682: 679: 676: 673: 670: 667: 664: 661: 658: 653: 649: 645: 640: 636: 607: 587: 584: 581: 578: 575: 572: 569: 566: 563: 560: 557: 554: 551: 548: 545: 542: 539: 536: 531: 527: 502: 499: 496: 493: 490: 466: 462: 458: 455: 452: 449: 429: 409: 406: 403: 400: 397: 394: 391: 388: 385: 382: 379: 376: 373: 370: 367: 364: 359: 355: 338: 335: 217: 214: 189: 186: 99: 98: 60: 58: 51: 26: 9: 6: 4: 3: 2: 6959: 6948: 6945: 6943: 6940: 6939: 6937: 6922: 6914: 6913: 6910: 6904: 6901: 6899: 6896: 6894: 6891: 6887: 6884: 6883: 6882: 6879: 6878: 6876: 6872: 6866: 6863: 6861: 6858: 6854: 6851: 6850: 6849: 6846: 6844: 6841: 6839: 6836: 6834: 6831: 6830: 6828: 6824: 6818: 6815: 6813: 6810: 6808: 6805: 6803: 6800: 6798: 6795: 6793: 6790: 6788: 6785: 6783: 6780: 6778: 6775: 6773: 6770: 6768: 6765: 6763: 6760: 6758: 6757:Quantum logic 6755: 6753: 6750: 6748: 6745: 6743: 6740: 6738: 6735: 6733: 6730: 6728: 6725: 6723: 6720: 6716: 6713: 6712: 6711: 6708: 6706: 6703: 6701: 6698: 6696: 6693: 6689: 6686: 6685: 6684: 6681: 6679: 6676: 6674: 6671: 6669: 6666: 6665: 6663: 6661: 6657: 6651: 6648: 6646: 6643: 6641: 6638: 6636: 6633: 6631: 6628: 6626: 6623: 6621: 6618: 6616: 6613: 6611: 6610:Quantum chaos 6608: 6606: 6603: 6601: 6598: 6597: 6595: 6593: 6589: 6583: 6580: 6578: 6577:Stern–Gerlach 6575: 6573: 6570: 6568: 6565: 6563: 6560: 6558: 6555: 6553: 6550: 6548: 6545: 6543: 6540: 6538: 6535: 6533: 6530: 6529: 6527: 6523: 6517: 6514: 6512: 6511:Transactional 6509: 6507: 6504: 6502: 6501:Quantum logic 6499: 6497: 6494: 6492: 6489: 6483: 6480: 6479: 6478: 6475: 6474: 6473: 6470: 6468: 6465: 6463: 6460: 6458: 6455: 6453: 6450: 6448: 6445: 6444: 6442: 6440: 6436: 6430: 6427: 6425: 6422: 6420: 6417: 6415: 6412: 6410: 6407: 6406: 6404: 6400: 6394: 6391: 6389: 6386: 6384: 6381: 6379: 6376: 6374: 6371: 6369: 6366: 6364: 6361: 6360: 6358: 6354: 6346: 6343: 6341: 6338: 6337: 6336: 6335:Wave function 6333: 6331: 6328: 6326: 6323: 6321: 6318: 6316: 6313: 6311: 6310:Superposition 6308: 6306: 6305:Quantum state 6303: 6301: 6298: 6296: 6293: 6291: 6288: 6286: 6283: 6281: 6278: 6276: 6273: 6269: 6266: 6264: 6261: 6259: 6258:Excited state 6256: 6254: 6251: 6250: 6249: 6246: 6244: 6241: 6239: 6236: 6234: 6231: 6229: 6226: 6225: 6223: 6219: 6213: 6210: 6208: 6205: 6203: 6200: 6196: 6193: 6192: 6191: 6188: 6186: 6183: 6182: 6180: 6176: 6172: 6165: 6160: 6158: 6153: 6151: 6146: 6145: 6142: 6136: 6132: 6129: 6126: 6124: 6121: 6119: 6116: 6114: 6111: 6109: 6106: 6105: 6093: 6087: 6079: 6073: 6069: 6065: 6064: 6059: 6058:Greene, Brian 6053: 6045: 6039: 6035: 6028: 6020: 6016: 6012: 6008: 6004: 6000: 5995: 5990: 5986: 5982: 5978: 5971: 5964: 5960: 5956: 5952: 5947: 5939: 5937:0-521-64222-1 5933: 5929: 5928: 5923: 5917: 5915: 5906: 5902: 5897: 5892: 5888: 5884: 5880: 5876: 5872: 5865: 5857: 5853: 5849: 5845: 5841: 5837: 5830: 5822: 5820:0-521-31162-4 5816: 5812: 5805: 5798: 5792: 5784: 5778: 5774: 5770: 5766: 5765: 5757: 5749: 5745: 5741: 5740: 5732: 5724: 5723: 5715: 5711: 5700: 5697: 5695: 5692: 5690: 5687: 5685: 5682: 5680: 5677: 5675: 5672: 5670: 5669:MoirĂ© pattern 5667: 5665: 5662: 5660: 5657: 5655: 5652: 5650: 5647: 5645: 5642: 5640: 5637: 5635: 5632: 5630: 5627: 5625: 5622: 5621: 5614: 5611: 5609: 5605: 5601: 5597: 5593: 5589: 5579: 5577: 5573: 5569: 5568:optical fiber 5565: 5561: 5560:coaxial cable 5556: 5548: 5544: 5540: 5536: 5531: 5526: 5516: 5514: 5510: 5505: 5503: 5498: 5494: 5490: 5486: 5481: 5479: 5475: 5471: 5466: 5464: 5460: 5456: 5452: 5448: 5437: 5432: 5430: 5426: 5421: 5417: 5413: 5408: 5406: 5402: 5398: 5394: 5390: 5386: 5382: 5378: 5372: 5357: 5355: 5336: 5333: 5330: 5322: 5294: 5291: 5288: 5280: 5267: 5263: 5258: 5244: 5222: 5209: 5206: 5203: 5195: 5182: 5177: 5164: 5161: 5158: 5150: 5132: 5113: 5110: 5107: 5099: 5094: 5083: 5080: 5077: 5069: 5061: 5055: 5052: 5049: 5041: 5030: 5027: 5024: 5016: 5011: 4998: 4982: 4962: 4942: 4919: 4916: 4913: 4905: 4897: 4891: 4888: 4885: 4877: 4869: 4863: 4860: 4857: 4828: 4825: 4822: 4814: 4786: 4783: 4780: 4772: 4758: 4739: 4736: 4733: 4725: 4720: 4709: 4706: 4703: 4695: 4687: 4681: 4678: 4675: 4667: 4656: 4653: 4650: 4642: 4637: 4626: 4621: 4608: 4605: 4602: 4594: 4581: 4576: 4563: 4560: 4557: 4549: 4536: 4531: 4518: 4515: 4512: 4498: 4492: 4486: 4463: 4460: 4457: 4449: 4441: 4435: 4432: 4429: 4421: 4413: 4407: 4404: 4401: 4388:of two terms 4387: 4383: 4364: 4361: 4358: 4346: 4343: 4340: 4332: 4324: 4319: 4306: 4303: 4300: 4286: 4280: 4274: 4254: 4231: 4225: 4218: 4214: 4210: 4191: 4188: 4185: 4171: 4167: 4163: 4152: 4147: 4145: 4140: 4138: 4133: 4132: 4130: 4129: 4121: 4118: 4116: 4113: 4111: 4108: 4106: 4103: 4101: 4098: 4096: 4093: 4091: 4088: 4086: 4083: 4081: 4078: 4076: 4073: 4071: 4068: 4066: 4063: 4061: 4058: 4056: 4053: 4051: 4048: 4046: 4043: 4041: 4038: 4036: 4033: 4031: 4028: 4026: 4023: 4021: 4018: 4016: 4013: 4011: 4008: 4006: 4003: 4001: 3998: 3996: 3993: 3991: 3988: 3986: 3983: 3981: 3978: 3976: 3973: 3971: 3968: 3966: 3963: 3961: 3958: 3956: 3953: 3951: 3948: 3946: 3943: 3941: 3938: 3936: 3933: 3931: 3928: 3926: 3923: 3921: 3918: 3916: 3913: 3911: 3908: 3906: 3903: 3901: 3898: 3896: 3893: 3892: 3885: 3884: 3877: 3874: 3872: 3869: 3867: 3864: 3862: 3859: 3857: 3854: 3852: 3851:Quantum chaos 3849: 3847: 3844: 3842: 3839: 3837: 3834: 3832: 3829: 3828: 3822: 3821: 3813: 3810: 3808: 3807:Transactional 3805: 3803: 3800: 3798: 3797:Quantum logic 3795: 3793: 3790: 3788: 3785: 3779: 3776: 3775: 3774: 3771: 3770: 3769: 3766: 3764: 3761: 3759: 3756: 3754: 3751: 3749: 3746: 3744: 3741: 3740: 3736: 3731: 3730: 3722: 3719: 3717: 3714: 3712: 3709: 3707: 3704: 3702: 3699: 3698: 3691: 3690: 3682: 3679: 3677: 3674: 3672: 3669: 3667: 3664: 3662: 3659: 3657: 3654: 3653: 3649: 3646: 3645: 3639: 3638: 3630: 3627: 3625: 3622: 3620: 3617: 3616: 3610: 3607: 3606: 3605: 3602: 3601: 3597: 3594: 3592: 3589: 3587: 3584: 3582: 3579: 3577: 3574: 3572: 3569: 3567: 3564: 3562: 3559: 3557: 3554: 3552: 3549: 3548: 3541: 3540: 3530: 3527: 3526: 3525: 3524:Wave function 3522: 3520: 3517: 3515: 3512: 3510: 3507: 3505: 3504:Superposition 3502: 3500: 3497: 3495: 3492: 3490: 3487: 3485: 3482: 3480: 3477: 3475: 3472: 3470: 3467: 3465: 3462: 3461: 3454: 3453: 3445: 3442: 3440: 3437: 3436: 3432: 3429: 3427: 3424: 3422: 3419: 3418: 3412: 3411: 3406: 3403: 3401: 3398: 3396: 3393: 3392: 3391: 3390: 3386: 3353: 3347: 3330: 3327: 3323: 3315: 3308: 3307: 3304: 3301: 3300: 3296: 3295: 3291: 3287: 3270: 3265: 3258: 3253: 3246: 3241: 3238: 3237: 3236: 3234: 3230: 3225: 3223: 3219: 3214: 3212: 3208: 3204: 3203:beam splitter 3199: 3190: 3186: 3182: 3179: 3174: 3171: 3167: 3161: 3152: 3148: 3146: 3141: 3136: 3129: 3116: 3097: 3093: 3089: 3073: 3069: 3062: 3059: 3041: 3037: 3020: 3016: 3010: 3007: 2991: 2987: 2983: 2967: 2963: 2959: 2945: 2937: 2934: 2921: 2902: 2898: 2894: 2878: 2874: 2867: 2864: 2848: 2844: 2827: 2823: 2819: 2816: 2800: 2795: 2791: 2787: 2771: 2766: 2762: 2758: 2755: 2752: 2745: 2742: 2729: 2725: 2718: 2715: 2704: 2701: 2698: 2684: 2676: 2673: 2667: 2654: 2646: 2643: 2640: 2624: 2620: 2613: 2609: 2592: 2588: 2584: 2576: 2573: 2570: 2554: 2550: 2543: 2539: 2522: 2518: 2514: 2508: 2505: 2494: 2486: 2483: 2481: 2464: 2446: 2443: 2440: 2424: 2420: 2413: 2409: 2392: 2388: 2384: 2378: 2375: 2362: 2358: 2333: 2330: 2327: 2311: 2307: 2300: 2296: 2279: 2275: 2271: 2265: 2262: 2249: 2245: 2236: 2233: 2227: 2219: 2215: 2214: 2209: 2208: 2202: 2197: 2185: 2182: 2178: 2175: 2171: 2167: 2165: 2163: 2159: 2155: 2151: 2150:gravity waves 2147: 2138: 2136: 2132: 2127: 2125: 2120: 2107: 2100: 2096: 2093: 2087: 2083: 2073: 2060: 2057: 2050: 2046: 2042: 2038: 2034: 2029: 2026: 2023: 2018: 2015: 2012: 2008: 2000:To show that 1998: 1985: 1980: 1976: 1973: 1967: 1962: 1959: 1956: 1952: 1948: 1943: 1939: 1918: 1915: 1912: 1909: 1906: 1886: 1883: 1880: 1860: 1836: 1832: 1828: 1824: 1820: 1812: 1807: 1805: 1801: 1800:3-phase power 1796: 1788: 1785: 1782: 1773: 1764: 1761: 1755: 1750: 1741: 1725: 1722: 1719: 1715: 1710: 1705: 1701: 1692: 1688: 1675: 1672: 1667: 1664: 1659: 1656: 1651: 1648: 1643: 1640: 1635: 1631: 1628: 1625: 1622: 1611: 1608: 1595: 1592: 1589: 1586: 1583: 1580: 1577: 1574: 1571: 1568: 1565: 1560: 1556: 1553: 1550: 1547: 1536: 1533: 1520: 1515: 1511: 1508: 1505: 1502: 1499: 1496: 1490: 1485: 1481: 1478: 1475: 1469: 1466: 1455: 1453: 1449: 1445: 1440: 1431: 1423: 1400: 1397: 1392: 1388: 1384: 1379: 1375: 1353: 1350: 1344: 1340: 1336: 1330: 1327: 1307: 1304: 1301: 1298: 1294: 1291: 1288: 1284: 1281: 1277: 1274: 1271: 1267: 1264: 1261: 1258: 1255: 1252: 1249: 1246: 1234: 1231: 1214: 1211: 1208: 1205: 1202: 1196: 1193: 1190: 1187: 1184: 1179: 1175: 1171: 1166: 1162: 1141: 1138: 1134: 1127: 1123: 1119: 1113: 1110: 1106: 1085: 1082: 1079: 1076: 1073: 1070: 1067: 1064: 1061: 1058: 1055: 1052: 1049: 1046: 1043: 1040: 1037: 1034: 1031: 1028: 1025: 1013: 1010: 1009: 1008: 994: 990: 986: 966: 962: 956: 953: 948: 945: 942: 939: 936: 933: 929: 925: 922: 918: 913: 910: 905: 901: 898: 895: 892: 889: 884: 880: 876: 871: 867: 846: 842: 837: 833: 830: 827: 821: 817: 814: 810: 805: 801: 798: 795: 789: 785: 782: 779: 776: 773: 770: 767: 764: 761: 758: 755: 747: 731: 722: 719: 716: 713: 710: 707: 704: 698: 695: 692: 686: 683: 680: 677: 674: 668: 665: 659: 656: 651: 647: 643: 638: 634: 625: 621: 605: 582: 579: 576: 573: 570: 567: 564: 558: 555: 552: 549: 543: 540: 537: 529: 525: 516: 500: 497: 494: 491: 488: 480: 464: 460: 456: 453: 450: 447: 427: 404: 401: 398: 395: 392: 386: 383: 380: 377: 371: 368: 365: 357: 353: 344: 334: 332: 327: 325: 321: 317: 316:laser speckle 313: 307: 303: 297: 289: 288:even multiple 285: 275: 271: 268: 264: 260: 256: 230: 222: 213: 211: 207: 203: 199: 195: 185: 183: 179: 178:gravity waves 175: 171: 167: 163: 159: 158: 153: 152: 147: 146: 141: 138: 134: 130: 122: 118: 114: 110: 105: 95: 92: 84: 81:February 2022 74: 70: 64: 61:This article 59: 50: 49: 44: 40: 39:MoirĂ© pattern 33: 19: 6942:Interference 6640:Quantum mind 6552:Franck–Hertz 6414:Klein–Gordon 6363:Formulations 6356:Formulations 6285:Interference 6284: 6275:Entanglement 6253:Ground state 6248:Energy level 6221:Fundamentals 6185:Introduction 6091: 6086: 6062: 6052: 6033: 6027: 5984: 5980: 5970: 5946: 5925: 5878: 5874: 5864: 5839: 5835: 5829: 5810: 5804: 5791: 5763: 5756: 5738: 5731: 5721: 5714: 5612: 5585: 5552: 5506: 5482: 5467: 5455:Thomas Young 5453: 5450: 5409: 5396: 5385:interference 5380: 5374: 5360:Applications 5266:matter waves 5259: 4996: 4759: 4209:wavefunction 4168:– resembles 4161: 4160: 3706:Klein–Gordon 3642:Formulations 3479:Energy level 3474:Entanglement 3457:Fundamentals 3444:Interference 3443: 3395:Introduction 3262:An oil spill 3226: 3215: 3200: 3196: 3187: 3183: 3175: 3162: 3158: 3149: 3140:polarization 3137: 3130: 2938: 2935: 2677: 2675:is given by 2671: 2668: 2487: 2484: 2465: 2237: 2231: 2223: 2217: 2212: 2211: 2206: 2205: 2201:optical flat 2158:matter waves 2144: 2128: 2121: 2074: 1999: 1808: 1797: 1794: 1786: 1781:point source 1778: 1762: 1745: 1742: 1693: 1689: 1612: 1609: 1537: 1534: 1456: 1454:is given by 1451: 1447: 1443: 1436: 1232: 1011: 340: 331:matter waves 328: 308: 304: 296:odd multiple 295: 287: 281: 252: 210:Thomas Young 205: 201: 194:interference 193: 191: 182:matter waves 156: 155: 150: 149: 143: 133:interference 132: 126: 120: 117:Out of phase 112: 87: 78: 62: 6898:EPR paradox 6678:Quantum bus 6547:Double-slit 6525:Experiments 6491:Many-worlds 6429:Schrödinger 6393:Phase space 6383:Schrödinger 6373:Interaction 6330:Uncertainty 6300:Nonlocality 6295:Measurement 6290:Decoherence 6280:Hamiltonian 5639:Diffraction 5509:slip gauges 5502:calibration 5393:frequencies 5354:matter wave 4217:probability 4095:von Neumann 4080:Schrödinger 3856:EPR paradox 3787:Many-worlds 3721:Schrödinger 3676:Schrödinger 3671:Phase-space 3661:Interaction 3566:Double-slit 3544:Experiments 3519:Uncertainty 3489:Nonlocality 3484:Measurement 3469:Decoherence 3439:Hamiltonian 3290:Matter wave 3229:iridescence 2220:, are seen. 1873:waves from 1439:plane waves 6936:Categories 6826:Extensions 6660:Technology 6506:Relational 6457:Copenhagen 6368:Heisenberg 6315:Tunnelling 6178:Background 5955:Leighton R 5706:References 5600:absorption 5543:telescopes 5405:difference 4090:Sommerfeld 4005:Heisenberg 4000:Gutzwiller 3940:de Broglie 3888:Scientists 3802:Relational 3753:Copenhagen 3656:Heisenberg 3514:Tunnelling 3415:Background 3284:See also: 3178:laser beam 2146:Mechanical 1754:wavelength 744:Using the 479:wavenumber 343:sinusoidal 278:thickness. 263:vector sum 216:Mechanisms 6532:Bell test 6402:Equations 6228:Born rule 6011:1367-2630 5994:1210.6243 5951:Feynman R 5922:Born, Max 5836:Phys. Rev 5604:impedance 5564:waveguide 5489:Michelson 5397:perceived 5377:acoustics 5319:Ψ 5277:Ψ 5192:Ψ 5147:Ψ 5100:∗ 5091:Ψ 5066:Ψ 5038:Ψ 5017:∗ 5008:Ψ 4902:Ψ 4874:Ψ 4852:Ψ 4811:Ψ 4769:Ψ 4760:Usually, 4726:∗ 4717:Ψ 4692:Ψ 4664:Ψ 4643:∗ 4634:Ψ 4591:Ψ 4546:Ψ 4507:Ψ 4446:Ψ 4418:Ψ 4396:Ψ 4353:Ψ 4333:∗ 4329:Ψ 4295:Ψ 4180:Ψ 4120:Zeilinger 3965:Ehrenfest 3694:Equations 3371:⟩ 3368:Ψ 3357:^ 3345:⟩ 3342:Ψ 3319:ℏ 3094:φ 3090:− 3070:φ 3063:⁡ 2899:φ 2895:− 2875:φ 2868:⁡ 2759:∝ 2730:∗ 2702:∫ 2644:ω 2641:− 2621:φ 2574:ω 2571:− 2551:φ 2444:ω 2441:− 2421:φ 2331:ω 2328:− 2308:φ 2226:intensity 2097:π 2047:φ 2027:− 2009:∑ 1977:π 1960:− 1953:φ 1949:− 1940:φ 1916:− 1833:φ 1726:θ 1723:⁡ 1716:λ 1676:… 1660:± 1644:± 1636:λ 1632:θ 1629:⁡ 1593:… 1584:± 1575:± 1561:λ 1557:θ 1554:⁡ 1516:λ 1512:θ 1509:⁡ 1500:π 1486:λ 1479:π 1467:φ 1464:Δ 1337:φ 1331:⁡ 1308:… 1302:π 1292:π 1282:π 1275:π 1272:− 1265:π 1259:− 1253:… 1247:φ 1212:ω 1209:− 1197:⁡ 1120:φ 1114:⁡ 1086:… 1080:π 1071:π 1056:π 1050:− 1044:π 1038:− 1032:… 1026:φ 987:φ 954:φ 943:ω 940:− 926:⁡ 911:φ 902:⁡ 818:⁡ 799:− 786:⁡ 771:⁡ 759:⁡ 723:φ 714:ω 711:− 699:⁡ 684:ω 681:− 669:⁡ 624:superpose 606:φ 583:φ 574:ω 571:− 559:⁡ 498:π 489:ω 465:λ 457:π 402:ω 399:− 387:⁡ 259:amplitude 212:in 1801. 192:The word 188:Etymology 6921:Category 6715:Timeline 6467:Ensemble 6447:Bayesian 6340:Collapse 6212:Glossary 6195:Timeline 6131:Archived 6060:(1999). 5959:Sands M. 5905:25401860 5617:See also 5596:velocity 4045:Millikan 3970:Einstein 3955:Davisson 3910:Blackett 3895:Aharonov 3763:Ensemble 3743:Bayesian 3648:Overview 3529:Collapse 3509:Symmetry 3400:Glossary 3209:and the 2181:coherent 1931:, where 1802:and the 170:acoustic 137:coherent 109:In phase 6874:Related 6853:History 6592:Science 6424:Rydberg 6190:History 5883:Bibcode 5844:Bibcode 5608:crystal 5493:cadmium 5420:tremolo 4085:Simmons 4075:Rydberg 4040:Moseley 4020:Kramers 4010:Hilbert 3995:Glauber 3990:Feynman 3975:Everett 3945:Compton 3716:Rydberg 3405:History 3166:sodium- 2174:complex 2154:optical 1811:phasors 620:radians 513:is the 477:is the 129:physics 67:Please 6567:Popper 6074:  6068:97–109 6040:  6019:832961 6017:  6009:  5957:, and 5934:  5903:  5817:  5779:  5699:Upfade 5416:unison 5412:tuning 5401:volume 5389:sounds 5383:is an 4172:. 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Index

Destructive interference
Interference (communication)
Moiré pattern
Interference pattern (electromyography)
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When two or more waves travel through a medium and superpose then the resultant intensity do not distributed uniformly in the space. At some places, it is maximum while at some other places it is minimum. This non uniform distribution of intensity or energy of light is known as interference.
In phase
Out of phase
physics
coherent
waves
phase difference
light
radio
acoustic
surface water waves
gravity waves
matter waves
Latin
Thomas Young


principle of superposition of waves
amplitude
vector sum
crest

phase

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