Security improvement of using modified coherent state for quantum cryptography

Details Security improvement of using modified coherent state for quantum cryptography Security improvement of using modified coherent state for quantum cryptography

2005-01-30

arxiv.org/abs/quant-ph/0501175v1

Physics

Quantum Physics

5 pages, 2 figures, to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.71.032315

Weak coherent states as a photon source for quantum cryptography have limit in secure data rate and transmission distance because of the presence of multi-photon events and loss in transmission line. Two-photon events in a coherent state can be taken out by a two-photon interference scheme. We investigate the security issue of utilizing this modified coherent state in quantum cryptography. A 4 dB improvement in secure data rate or a nearly two-fold increase in transmission distance over the coherent state are found. With a recently proposed and improved encoding strategy, further improvement is possible.

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