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Manipulation of Quantum Nonlocality of the Single-Photon Entangled State via Beam Splitter |
| ZHOU Qing-Ping1,2,3;FANG Mao-Fa1,2;LIU Xiao-Juan2 |
| 1Department of Physics, Hunan Normal University, Changsha 410081
2Anhui Institute Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031
3Department of Information and Automatization, Jishou University, Zhangjiajie 427000 |
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| Cite this article: |
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ZHOU Qing-Ping, FANG Mao-Fa, LIU Xiao-Juan 2005 Chin. Phys. Lett. 22 12-14 |
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Abstract Quantum nonlocality of the single-photon entangled state emerging from a beam splitter with arbitrary controlling parameters is investigated by means of the parity measurement. The condition of the maximal violation of the Bell-CHSH inequality is obtained for the single-photon entangled state. Under the condition of the small coherent intensity J (J=0.1) and the phase difference γαβ of the two coherent displacements being opposite to the internal phase shift Ф of the beam splitter (γαβ =-Ф), we find that the quantum nonlocality depends only on the reflection coefficient $R$ of the beam splitter, while Ф plays an important role for selecting γαβ . The strongest quantum nonlocality can be observed for a 50:50 beam splitter. If R deviates from the intermediate value 0.5, the quantum nonlocality decreases gradually, even vanishes. Our results provide a method to observe and manipulate the quantum nonlocality of the single-photon entangled state by adjusting the parameters of the coherent displacements and the beam splitter.
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03.65.Ud
42.50.Dv
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Published: 01 January 2005
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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42.50.Dv
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(Quantum state engineering and measurements)
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