中国物理B ›› 2009, Vol. 18 ›› Issue (1): 51-55.doi: 10.1088/1674-1056/18/1/009

• GENERAL • 上一篇    下一篇

Linear optical realization of unambiguous quantum state comparison

林青   

  1. College of Information Science and Engineering, Huaqiao University, Quanzhou 362021, China
  • 收稿日期:2008-03-25 修回日期:2008-05-20 出版日期:2009-01-20 发布日期:2009-01-20
  • 基金资助:
    Project supported by the Research Projects of Huaqiao University of China (Grant No 07BS406).

Linear optical realization of unambiguous quantum state comparison

Lin Qing(林青)†   

  1. College of Information Science and Engineering, Huaqiao University, Quanzhou 362021, China
  • Received:2008-03-25 Revised:2008-05-20 Online:2009-01-20 Published:2009-01-20
  • Supported by:
    Project supported by the Research Projects of Huaqiao University of China (Grant No 07BS406).

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摘要： 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.

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.

Key words: quantum state comparison, linear optics, quantum fingerprinting

中图分类号:  (Quantum optics)

  • 42.50.-p
03.67.Hk (Quantum communication) 03.67.Lx (Quantum computation architectures and implementations)