Entanglement and nonlocality in multi-particle systems
Entanglement and nonlocality in multi-particle systems
Margaret D. Reid(), Qiong-Yi He, Peter D. Drummond
ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122, Australia
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.
Corresponding Author(s):
Reid Margaret D.,Email:MDREID@groupwise.swin.edu.au
引用本文:
. Entanglement and nonlocality in multi-particle systems[J]. Frontiers of Physics, 2012, 7(1): 72-85.
Margaret D. Reid, Qiong-Yi He, Peter D. Drummond. Entanglement and nonlocality in multi-particle systems. Front. Phys. , 2012, 7(1): 72-85.
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