Security and entanglement in differential-phase-shift quantum key distribution

Details Security and entanglement in differential-phase-shift quantum key distribution Security and entanglement in differential-phase-shift quantum key distribution

2010-02-04

arxiv.org/abs/1002.0953v1

Physics

Quantum Physics

11 pages, 1 figure

Scientific paper

The differential-phase-shift quantum key distribution protocol is formalised as a prepare-and-measure scheme and translated into an equivalent entanglement-based protocol. A necessary condition for security is that Bob's measurement can detect the entanglement of the distributed state in the entanglement-based translation, which implies that his measurement is described by non-commuting POVM elements. This condition is shown to be met.

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