Quantum spin squeezing

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• 作者：Jian  ; Ma^a ;   ; ^b ;   ; ^{majian84@gmail.com} ; Xiaoguang  ; Wang^a ;   ; ^b ;   ; ^{xgwang@zimp.zju.edu.cn} ; C.P.  ; Sun^a ;   ; ^c ; Franco  ; Nori^a ;   ; ^d
• 刊名：Physics Reports
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：509
• 期：2-3
• 页码：89-165
• 全文大小：3482 K

文摘

This paper reviews quantum spin squeezing, which characterizes the sensitivity of a state with respect to SU(2) rotations, and is significant for both entanglement detection and high-precision metrology. We first present various definitions of spin squeezing parameters, explain their origin and properties for typical states, and then discuss spin-squeezed states produced with nonlinear twisting Hamiltonians. Afterward, we explain pairwise correlations and entanglement in spin-squeezed states, as well as the relations between spin squeezing and quantum Fisher information, where the latter plays a central role in quantum metrology. We also review the applications of spin squeezing for detecting quantum chaos and quantum phase transitions, as well as the influence of decoherence on spin squeezing. Finally, we review several experimental realizations of spin squeezing, as well as their corresponding theoretical backgrounds, including: producing spin-squeezed states via particle collisions in Bose¨CEinstein condensates, transferring photon squeezing to atomic ensembles, and generating spin squeezing via quantum non-demolition measurements.