The quantum key distribution system based on polarization states produced by phase modulation

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Abstract
A method that can generate all kinds of nonorthogonal polarization states is induced for long distance and high bit rate generation quantum key distribution. T he polarization states are synthesized by two linearly polarization states contr olled by phase modulator. The modulator is allowed to produced non-quarter_wave phase delay so that can compensate the influence of birefrmgence during transmis sion throuogh the fiber. The structures of the encoder and the decoder based on the method are also described that can effectively reduce the bit error rate.

Keywords:
quantum key distribution /

phase coding /

polarization coding
Authors and contacts
Tang Zhi-Lie¹,

Li Ming¹,

Wei Zheng-Jun¹,

Lu Fei¹,

Liao Chang-Jun²,

Liu Song-Hao²

(1)华南师范大学物理与电信工程学院，广州 510631; (2)华南师范大学信息光电子科技学院，广州 510631
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