Sudden vanishing of spin squeezing under decoherence

Journal Article · Mon Feb 15 04:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.022106· OSTI ID:21408181

Xiaoguang, Wang ^[1]; Miranowicz, Adam ^[1]; Liu, Yu-xi ^[1]; Sun, C P ^[2]; Nori, Franco ^[1]

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1. Advanced Science Institute, Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198 (Japan)
2. Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China)

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.

• OSTI ID: 21408181
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
ANGULAR MOMENTUM
CORRELATIONS
DAMPING
MANY-BODY PROBLEM
PARTICLE PROPERTIES
QUANTUM ENTANGLEMENT
SPIN