| Quantum entanglement and quantum nonlocality for N-photon entangled states |
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| 引用本文： | 孙艳华,匡乐满. Quantum entanglement and quantum nonlocality for N-photon entangled states[J]. 中国物理, 2006, 15(4): 681-686 |
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| 作者姓名： | 孙艳华 匡乐满 |
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| 作者单位： | Department of Physics, Hunan Normal University,Changsha 410081, China;Haikou College of Economic and Vocational Technology, Haikou 570203, China;Department of Physics, Hunan Normal University,Changsha 410081, China |
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| 基金项目： | Project supported by the National Fundamental Research Program (Grant No 2001CB309310), the National Natural Science Foundation of China (Grant Nos 10325523, 90203018 and 10075018), the Foundation of the Ministry of Education of China,and the Educational Committee of Hunan Province (Grant Nos 200248 and 02A026). |
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| 摘 要： | Quantum entanglement and quantum nonlocality of N-photon entangled states |psiN mrangle=Cm[cosgamma|N-mrangle1|mrangle2 +e{iθm}singamma|mrangle1|N-mrangle2] and their superpositions are studied. We point out that the relativephase θm affects the quantum nonlocality but not the quantumentanglement for the state |psiN mrangle. We show thatquantum nonlocality can be controlled and manipulated by adjustingthe state parameters of |psiN mrangle, superpositioncoefficients, and the azimuthal angles of the Bell operator. Wealso show that the violation of the Bell inequality can reach itsmaximal value under certain conditions. It is found that quantumsuperpositions based on |psiN mrangle can increase theamount of entanglement, and give more ways to reach the maximalviolation of the Bell inequality.
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| 关 键 词： | 量子纠缠 量子非定域性 Bell不等式 量子理论 |
| 收稿时间： | 2005-08-15 |
| 修稿时间： | 2005-09-09 |
Quantum entanglement and quantum nonlocality for N-photon entangled states |
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| Sun Yan-Hua and Kuang Le-Man. Quantum entanglement and quantum nonlocality for N-photon entangled states[J]. Chinese Physics, 2006, 15(4): 681-686 |
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| Authors: | Sun Yan-Hua and Kuang Le-Man |
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| Affiliation: | Department of Physics, Hunan Normal University,Changsha 410081, China; Department of Physics, Hunan Normal University,Changsha 410081, China;Haikou College of Economic and Vocational Technology, Haikou 570203, China |
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| Abstract: | Quantum entanglement and quantum nonlocality of N-photon entangled states |psiN mrangle=Cm[cosgamma|N-mrangle1|mrangle2 +e{iθm}singamma|mrangle1|N-mrangle2] and their superpositions are studied. We point out that the relativephase θm affects the quantum nonlocality but not the quantumentanglement for the state |psiN mrangle. We show thatquantum nonlocality can be controlled and manipulated by adjustingthe state parameters of |psiN mrangle, superpositioncoefficients, and the azimuthal angles of the Bell operator. Wealso show that the violation of the Bell inequality can reach itsmaximal value under certain conditions. It is found that quantumsuperpositions based on |psiN mrangle can increase theamount of entanglement, and give more ways to reach the maximalviolation of the Bell inequality. |
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| Keywords: | quantum entanglement quantum nonlocality Bell inequality |
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