Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11f5004c&link_type=abstract
New Journal of Physics, Volume 11, Issue 6, pp. 065004 (2009).
Physics
3
Scientific paper
Polarization-encoding provides a promising approach for the practical quantum key distribution (QKD) system due to the simple encoding and decoding method. Here we present a long-term stable polarization-encoding QKD with a real-time polarization control. The polarization of the signal photons in the optical fiber was maintained stable by using time-division-multiplexed reference pulses for feedback control. We implemented this technique in the QKD experiment in 50 km fiber to show that it could facilitate polarization-encoded quantum communication. The system operated stably for ~460 min, and the quantum bit error rate was ~5.27%. The raw key generating rate in this system was kept stable at ~500 bits s-1. The advantages and disadvantages of the previous polarization-control schemes were also rigorously analyzed.
Chen Jiahua
Gu Xuejun
Wu Edward
Wu Guangheng
Xu Lan
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