Spin Squeezing, Negative Correlations, and Concurrence in the Quantum Kicked Top Model

Abstract

We study spin squeezing, negative correlations, and concurrence in the quantum kicked top model. We prove that the spin squeezing and negative correlations are equivalent for spin systems with only symmetric Dicke states populated. We numerically analyze spin squeezing parameters and concurrence in this model, and find that the maximal spin squeezing direction, which refers to the minimal pairwise correlation direction, is strongly influenced by quantum chaos. Entanglement (spin squeezing) sudden death and sudden birth occur alternatively for the periodic and quasi-periodic cases, while only entanglement (spin squeezing) sudden death is found for the chaotic case.

8 pages, 6 figures

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Cited by in corpus (7)

• Sudden vanishing and reappearance of nonclassical effects: General occurrence of finite-time decays and periodic vanishings of nonclassicality and entanglement witnesses
• Multifractality in quasienergy space of coherent states as a signature of quantum chaos
• Spin squeezing and concurrence
• Pairwise quantum discord for a symmetric multi-qubit system in different types of noisy channels
• Chaos controlled and disorder driven phase transitions induced by breaking permutation symmetry
• Spin Squeezing, Macrorealism and the Heisenberg uncertainty principle
• Floquet thermalization by power-law induced permutation symmetry breaking