Stability of Phase-modulated Quantum Key Distribution System

Details Stability of Phase-modulated Quantum Key Distribution System Stability of Phase-modulated Quantum Key Distribution System

2004-08-05

arxiv.org/abs/quant-ph/0408031v1

Appl. Phys. Lett. l86, 221103 (2005)

Physics

Quantum Physics

9 pages, 3 figues

Scientific paper

10.1063/1.1931824

Phase drift and random fluctuation of interference visibility in double unbalanced M-Z QKD system are observed and distinguished. It has been found that the interference visibilities are influenced deeply by the disturbance of transmission fiber. Theory analysis shows that the fluctuation is derived from the envioronmental disturbance on polarization characteristic of fiber, especially including transmission fiber. Finally, stability conditions of one-way anti-disturbed M-Z QKD system are given out, which provides a theoretical guide in pragmatic anti-disturbed QKD.

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