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篇目详细内容 |
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【篇名】 |
Entanglement and nonlocality in multi-particle systems |
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【刊名】 |
Frontiers of Physics |
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【刊名缩写】 |
Front. Phys |
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【ISSN】 |
2095-0462 |
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【EISSN】 |
2095-0470 |
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【DOI】 |
10.1007/s11467-011-0233-9 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2012 |
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【卷期】 |
7
卷1期 |
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【页码】 |
72-85
页,共
14
页 |
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【作者】 |
Margaret D. Reid;
Qiong-Yi He;
Peter D. Drummond;
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【关键词】 |
entanglement; quantum nonlocality; multi-particle; two-well Bose–Einstein condensates (BEC) |
【摘要】 |
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Entanglement, the Einstein–Podolsky–Rosen (EPR) paradox and Bell’s failure of local-hiddenvariable (LHV) theories are three historically famous forms of “quantum nonlocality”. We give experimental criteria for these three forms of nonlocality in multi-particle systems, with the aim of better understanding the transition from microscopic to macroscopic nonlocality. We examine the nonlocality of N separated spin J systems. First, we obtain multipartite Bell inequalities that address the correlation between spin values measured at each site, and then we review spin squeezing inequalities that address the degree of reduction in the variance of collective spins. The latter have been particularly useful as a tool for investigating entanglement in Bose–Einstein condensates (BEC). We present solutions for two topical quantum states: multi-qubit Greenberger–Horne–Zeilinger (GHZ) states, and the ground state of a two-well BEC. |
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