Spin squeezing, negative correlations, and concurrence in the quantum kicked top model

2010/10/01 by Xiaoqian Wang, Jian Ma, Lijun Song +2
Computer Science · Physics and Astronomy · #Chaotic #Concurrence #Condensed matter physics #Neural Networks and Reservoir Computing #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum correlation #Quantum discord #Quantum entanglement #Quantum mechanics #Spin (aerodynamics) #Sudden death #quant-ph

paper · pdf · doi:10.1103/physreve.82.056205

published as Phys. Rev. E 82, 056205 (2010) · 8 pages, 6 figures

arxiv created 2010/10/01 · openalex publication_date 2010/11/12 · arxiv updated 2010/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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 quasiperiodic cases, while only entanglement (spin squeezing) sudden death is found for the chaotic case.

Citations

• Avoiding entanglement sudden death via measurement feedback control in a quantum network
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• Sudden Death of Entanglement
• Entanglement in many-body systems
• Quantum entanglement

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• Estimating the best separable approximation of non-pure spin-squeezed states