Security of quantum key distribution with bit and basis dependent detector flaws

Details Security of quantum key distribution with bit and basis dependent detector flaws Security of quantum key distribution with bit and basis dependent detector flaws

2008-07-04

arxiv.org/abs/0807.0767v4

Quant. Inf. Comp. 10, 0060 (2010)

Physics

Quantum Physics

10 pages, 4 figures; v4: rewritten for clarity

Scientific paper

We consider the security of the Bennett-Brassard 1984 (BB84) protocol for Quantum Key Distribution (QKD), in the presence of bit and basis dependent detector flaws. We suggest a powerful attack that can be used in systems with detector efficiency mismatch, even if the detector assignments are chosen randomly by Bob. A security proof is provided, valid for any basis dependent, possibly lossy, linear optical imperfections in the channel/receiver/detectors. The proof does not assume the so-called squashing detector model.

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