Quantum Key Distribution System with Six Polarization States Encoded by Phase Modulation
LIU Xiao-Bao, LIAO Chang-Jun, TANG Zhi-Lie, WANG Jin-Dong, LIU Song-Hao
Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, and School for Physics and Telecom Engineering, South China Normal University, Guangzhou 510006
Quantum Key Distribution System with Six Polarization States Encoded by Phase Modulation
LIU Xiao-Bao, LIAO Chang-Jun, TANG Zhi-Lie, WANG Jin-Dong, LIU Song-Hao
Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, and School for Physics and Telecom Engineering, South China Normal University, Guangzhou 510006
摘要An intrinsically stable quantum key distribution system (QKD) with six polarization states encoded by phase modulation is introduced. The encoder and decoder are in the same structures that consist of two polarizing Sagnac interferometers connected in tandem. The six polarization states are determined and distinguished by different sets of phase shifts induced by two respective electrically-driven integrated phase modulators. A mean visibility of interference fringes is kept stable at 97.58% for an hour's performance. Theoretical and experimental analyses show that the proposed QKD system features intrinsically stability immune from environment fluctuation.
Abstract：An intrinsically stable quantum key distribution system (QKD) with six polarization states encoded by phase modulation is introduced. The encoder and decoder are in the same structures that consist of two polarizing Sagnac interferometers connected in tandem. The six polarization states are determined and distinguished by different sets of phase shifts induced by two respective electrically-driven integrated phase modulators. A mean visibility of interference fringes is kept stable at 97.58% for an hour's performance. Theoretical and experimental analyses show that the proposed QKD system features intrinsically stability immune from environment fluctuation.
LIU Xiao-Bao;LIAO Chang-Jun;TANG Zhi-Lie; WANG Jin-Dong;LIU Song-Hao. Quantum Key Distribution System with Six Polarization States Encoded by Phase Modulation[J]. 中国物理快报, 2008, 25(11): 3856-3859.
LIU Xiao-Bao, LIAO Chang-Jun, TANG Zhi-Lie, WANG Jin-Dong, LIU Song-Hao. Quantum Key Distribution System with Six Polarization States Encoded by Phase Modulation. Chin. Phys. Lett., 2008, 25(11): 3856-3859.
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2008, Vol. 25 
