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dark fibre so that what is put in one end comes out the other end. The length is limited as the signal cannot be regenerated along the path. These three mean that a system will cost significantly more than other systems of encryption and networking. In order to be used by organisations that need to prove security, certification of security is required.
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Problems are the limited bandwidth. Because of this real systems use quantum encryption for the key exchange. The requirement to have a channel that can preserve the quantum state between sender and receiver means that an extra optic fibre needs to be installed. This fibre must be equivalent to a
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Quelles sont les adversités dans la cryptographie
Quantum?
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