Unconditionally secure quantum key-distribution with relatively strong signal pulse

Details Unconditionally secure quantum key-distribution with relatively strong signal pulse Unconditionally secure quantum key-distribution with relatively strong signal pulse

2007-11-22

arxiv.org/abs/0711.3526v1

Phys. Rev. A 77, 032341 (2008)

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevA.77.032341

We propose an unconditionally secure quantum key distribution (QKD) protocol, which uses a relatively strong signal pulse. While our protocol shares similar security bases as the Bennett 1992 protocol with a strong reference pulse (B92), our scheme uses a smaller number of detectors and it is robust against Rayleigh scattering in an optical fibre. We derive a lower bound of secret key generation rate of our protocol and show that our protocol can cover relatively long distances, assuming precise phase modulations and stable interferometers.

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