4.7 Article

Quantum chaos and operator fidelity metric

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PHYSICAL REVIEW E
卷 81, 期 1, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.81.017203

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We show that the recently introduced operator fidelity metric provides a natural tool to investigate the crossover to quantum chaotic behavior. This metric is an information-theoretic measure of the global stability of a unitary evolution against perturbations. We use random matrix theory arguments to conjecture that the operator fidelity metric can be used to discriminate phases with regular behavior from quantum chaotic ones. A numerical study of the onset of chaotic in the Dicke model is given in order to support the conjecture.

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