中国物理B ›› 2006, Vol. 15 ›› Issue (2): 371-374.doi: 10.1088/1009-1963/15/2/023

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A secure identification system using coherent state

何广强, 曾贵华   

  1. The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems,Electronic Engineering Department, Shanghai Jiaotong University, Shanghai 200030, China
  • 收稿日期:2004-12-19 修回日期:2005-07-06 出版日期:2006-02-20 发布日期:2006-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60472018).

A secure identification system using coherent states

He Guang-Qiang (何广强), Zeng Gui-Hua (曾贵华)   

  1. The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems, Electronic Engineering Department, Shanghai Jiaotong University, Shanghai 200030, China
  • Received:2004-12-19 Revised:2005-07-06 Online:2006-02-20 Published:2006-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60472018).

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摘要： A quantum identification system based on the transformation of polarization of a mesoscopic coherent state is proposed. Physically, an initial polarization state which carries the identity information is transformed into an arbitrary elliptical polarization state. To verify the identity of a communicator, a reverse procedure is performed by the receiver. For simply describing the transformation procedure, the analytical methods of Poincar\'{e} sphere and quaternion are adopted. Since quantum noise provides such a measurement uncertainty for the eavesdropping that the identity information cannot be retrieved from the elliptical polarization state, the proposed scheme is secure.

关键词: quantum identification, polarization encryption and decryption, quantum noise, Poincar\'{e} sphere

Abstract: A quantum identification system based on the transformation of polarization of a mesoscopic coherent state is proposed. Physically, an initial polarization state which carries the identity information is transformed into an arbitrary elliptical polarization state. To verify the identity of a communicator, a reverse procedure is performed by the receiver. For simply describing the transformation procedure, the analytical methods of Poincaré sphere and quaternion are adopted. Since quantum noise provides such a measurement uncertainty for the eavesdropping that the identity information cannot be retrieved from the elliptical polarization state, the proposed scheme is secure.

Key words: quantum identification, polarization encryption and decryption, quantum noise, Poincaré sphere

中图分类号:  (Quantum cryptography and communication security)

  • 03.67.Dd
42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)