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)
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
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.
Received: 05 November 2007
Revised: 10 December 2007
Accepted manuscript online:
(Quantum computation architectures and implementations)
Fund: 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.
Cite this article:
Tan Yong-Gang(谭勇刚), Cai Qing-Yu(蔡庆宇), and Shi Ting-Yun(史庭云) Indistinguishability of orthogonal time-separated bell states 2008 Chin. Phys. B 17 3194
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