| Original Articles |
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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 |
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| Cite this article: |
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LIU Xiao-Bao, LIAO Chang-Jun, TANG Zhi-Lie et al 2008 Chin. Phys. Lett. 25 3856-3859 |
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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.
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| Keywords:
03.67.Dd
03.67.Hk
42.79.Hp
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Received: 15 July 2008
Published: 25 October 2008
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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42.79.Hp
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(Optical processors, correlators, and modulators)
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