中国物理B ›› 2008, Vol. 17 ›› Issue (9): 3194-3197.doi: 10.1088/1674-1056/17/9/007

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Indistinguishability of orthogonal time-separated bell states

蔡庆宇1, 史庭云1, 谭勇刚2   

  1. (1)State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; (2)State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2007-11-05 修回日期:2007-12-10 出版日期:2008-09-08 发布日期:2008-09-08
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10504039) and the Youth Chenguang Project of Science and Technology of Wuhan City of China.

Indistinguishability of orthogonal time-separated bell states

Tan Yong-Gang(谭勇刚)a)b), Cai Qing-Yu(蔡庆宇)a)†, and Shi Ting-Yun(史庭云)a)   

  1. a State Key Laboratory of Magnetic Resonances and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; b Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-11-05 Revised:2007-12-10 Online:2008-09-08 Published:2008-09-08
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10504039) and the Youth Chenguang Project of Science and Technology of Wuhan City of China.

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摘要： This paper proves that it is impossible to identify orthogonally time-separated Bell states. If two qubits of a Bell state interact with the measurement apparatus at different time, any attempt to identify this state will disturb it.

关键词: Bell states, time-separated, indistinguishability

Abstract: This paper proves that it is impossible to identify orthogonally time-separated Bell states. If two qubits of a Bell state interact with the measurement apparatus at different time, any attempt to identify this state will disturb it.

Key words: Bell states, time-separated, indistinguishability

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.65.Ta (Foundations of quantum mechanics; measurement theory) 03.67.Dd (Quantum cryptography and communication security) 03.67.Lx (Quantum computation architectures and implementations)