Quantum key distribution based on phase encoding in long-distance communication fiber.
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.
Sun
Shi-Hai
SH
Department of Physics, National University of Defense Technology, Changsha 410073, China.
Ma
Hai-Qiang
HQ
Han
Jia-Jia
JJ
Liang
Lin-Mei
LM
Li
Cheng-Zu
CZ