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Quantum key distribution based on phase encoding in long-distance communication fiber

Shi-Hai Sun, Hai-Qiang Ma, Jia-Jia Han, Lin-Mei Liang, and Cheng-Zu Li

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Abstract

A robust two-way quantum key distribution system based on phase encoding is demonstrated in 50 km and 100 km commercial communication fiber. The system can automatically compensate for birefringence effects and remain stable over 23 h. A low quantum bit error rate and high visibility are obtained. Furthermore, the storage fiber is unnecessary and train of pulses is only needed in the test with 100 km fiber.

© 2010 Optical Society of America

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