Bell's Inequality, Random Sequence, and Quantum Key Distribution

Details Bell's Inequality, Random Sequence, and Quantum Key Distribution Bell's Inequality, Random Sequence, and Quantum Key Distribution

2005-01-27

arxiv.org/abs/quant-ph/0501162v2

Physical Review A 71, 052329 (2005)

Physics

Quantum Physics

English corrected, 3 pages, RevTex

Scientific paper

10.1103/PhysRevA.71.052329

The Ekert 91 quantum key distribution (QKD) protocol appears to be secure whatever devices legitimate users adopt for the protocol, as long as the devices give a result that violates Bell's inequality. However, this is not the case if they ignore non-detection events because Eve can make use of the detection-loophole, as Larrson showed. We show that even when legitimate users take into account non-detection events Eve can successfully eavesdrop if the QKD system has been appropriately designed by the manufacturer. A loophole utilized here is that of `free-choice' (or `real randomness'). Local QKD devices with pseudo-random sequence generator installed in them can apparently violate Bell's inequality.

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