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Acta Physica Sinica

A highly stable differential phase shift key distribution QKD system

Mingming Li, Wang Fa-Qiang, Lu Yi-Qun, Zhao Feng, Chen Xia, Ruisheng Liang, Songhao Liu, 华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室,广州 510631

Published Jan 1, 2006• 2 citations
Publisher

Abstract

We propose and demonstrate an improved differential phase shift key distribution scheme. Alice uses a pulsed laser source and two cascaded fiber loops to get coherent pulses, then modulates them randomly under differential phase shift scheme, which compensates for the random polarization mode dispersion and phase shift. An interferometer made up of two Faraday mirrors is employed to detect single photon under gate mode. In one-way transmission, QKD is free from Trojan attack. Our experiment at setup can work stably for a long time (at least 24h) with an error ratio of 3%. The stable scheme is efficient, economical and favorable for practical application.

DOI
10.7498/aps.55.4642

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A new differential phase shift quantum key distribution system based on the intensity modulator with Faraday-Michelson interferometer is demonstrated experimentally. Some technologies are employed to improve the performance of the quantum key distribution system. These technologies include the clock generation technology of arbitrary frequency by a small scale frequency-split and phase locked loop scheme, the new method to acquire the half-wave voltage of the phase modulator with a high accuracy in the condition of the single photon count, and the auto-compensated polarization technology by the Faraday-Michelson interferometer. Finally, the quantum key distribution is achieved with a quantum bit error rate of 3.9% when the transmission distance reaches 50 km.