Sudden vanishing of spin squeezing under decoherence

In order to witness multipartite correlations beyond pairwise entanglement, spin-squeezing parameters are analytically calculated for a spin ensemble in a collective initial state under three different decoherence channels. It is shown that, in analogy to pairwise entanglement, the spin squeezing de...

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Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2010-02, Vol.81 (2), Article 022106
Main Authors: Wang, Xiaoguang, Miranowicz, Adam, Liu, Yu-xi, Sun, C. P., Nori, Franco
Format: Article
Language:English
Subjects:
AMPLITUDES
ANGULAR MOMENTUM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CORRELATIONS
DAMPING
MANY-BODY PROBLEM
PARTICLE PROPERTIES
QUANTUM ENTANGLEMENT
SPIN
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cited_by cdi_FETCH-LOGICAL-c319t-4bcb33c109dbf7228302c91688e1eef5ca7cc3a505734d75cdddbd337c55c48a3
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container_title Physical review. A, Atomic, molecular, and optical physics
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description In order to witness multipartite correlations beyond pairwise entanglement, spin-squeezing parameters are analytically calculated for a spin ensemble in a collective initial state under three different decoherence channels. It is shown that, in analogy to pairwise entanglement, the spin squeezing described by different parameters can suddenly become zero at different vanishing times. This finding shows the general occurrence of sudden vanishing phenomena of quantum correlations in many-body systems, which here is referred to as spin-squeezing sudden death (SSSD). It is shown that the SSSD usually occurs due to decoherence and that SSSD never occurs for some initial states in the amplitude-damping channel. We also analytically obtain the vanishing times of spin squeezing.
doi_str_mv 10.1103/PhysRevA.81.022106
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subjects AMPLITUDES
ANGULAR MOMENTUM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CORRELATIONS
DAMPING
MANY-BODY PROBLEM
PARTICLE PROPERTIES
QUANTUM ENTANGLEMENT
SPIN
title Sudden vanishing of spin squeezing under decoherence
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