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Chin. Phys. B, 2009, Vol. 18(1): 51-55    DOI: 10.1088/1674-1056/18/1/009
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Linear optical realization of unambiguous quantum state comparison

Lin Qing(林青)
College of Information Science and Engineering, Huaqiao University, Quanzhou 362021, China
Abstract  In this paper, we propose an experimental scheme for unambiguous quantum state comparison assisted by linear optical manipulations, twin-photons produced from parametric down-conversion, and postselection from the coincidence measurement. In this scheme the preparation of the general two mixed qubit states with arbitrary prior probabilities and the realization of the optimal POVMs for unambiguous quantum state comparison are presented. This proposal is feasible by current experimental technology, and may be used in single-qubit quantum fingerprinting.
Keywords:  quantum state comparison      linear optics      quantum fingerprinting  
Received:  25 March 2008      Revised:  20 May 2008      Accepted manuscript online: 
PACS:  42.50.-p (Quantum optics)  
  03.67.Hk (Quantum communication)  
  03.67.Lx (Quantum computation architectures and implementations)  
Fund: Project supported by the Research Projects of Huaqiao University of China (Grant No 07BS406).

Cite this article: 

Lin Qing(林青) Linear optical realization of unambiguous quantum state comparison 2009 Chin. Phys. B 18 51

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