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Chinese Physics, 2006, Vol. 15(2): 371-374    DOI: 10.1088/1009-1963/15/2/023

A secure identification system using coherent states

He Guang-Qiang (何广强), Zeng Gui-Hua (曾贵华)
The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems, Electronic Engineering Department, Shanghai Jiaotong University, Shanghai 200030, China
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.
Keywords:  quantum identification      polarization encryption and decryption      quantum noise      Poincaré sphere  
Received:  19 December 2004      Revised:  06 July 2005      Accepted manuscript online: 
PACS:  03.67.Dd (Quantum cryptography and communication security)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60472018).

Cite this article: 

He Guang-Qiang (何广强), Zeng Gui-Hua (曾贵华) A secure identification system using coherent states 2006 Chinese Physics 15 371

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