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Quantum cryptography with and without entanglement

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arxiv quant-ph/0312011 v1 pith:VBVBZNL5 submitted 2003-12-01 quant-ph

classification quant-ph
keywords entanglementcryptographyquantumappliedattacksbecomescounter-measuresdisappeared
verification ladder T0 review T1 audit T2 compute T3 formal
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Quantum cryptography is reviewed, first using entanglement both for the intuition and for the experimental realizations. Next, the implementation is simplified in several steps until it becomes practical. At this point entanglement has disappeared. This method can be seen as a lesson of Applied Physics. Finally, security issues, e.g. photon number splitting attacks, and counter-measures are discussed.

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