Intercept-resend attacks in the Bennett-Brassard 1984 quantum key distribution protocol with weak coherent pulses

Details Intercept-resend attacks in the Bennett-Brassard 1984 quantum key distribution protocol with weak coherent pulses Intercept-resend attacks in the Bennett-Brassard 1984 quantum key distribution protocol with weak coherent pulses

2004-11-05

arxiv.org/abs/quant-ph/0411041v3

Phys. Rev. A 71, 062301 (2005)

Physics

Quantum Physics

11 pages, 3 figures. Version accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.71.062301

Unconditional security proofs of the Bennett-Brassard protocol of quantum key distribution have been obtained recently. These proofs cover also practical implementations that utilize weak coherent pulses in the four signal polarizations. Proven secure rates leave open the possibility that new proofs or new public discussion protocols obtain larger rates over increased distance. In this paper we investigate limits to error rate and signal losses that can be tolerated by future protocols and proofs.

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