Entanglement, avoided crossings and quantum chaos in an Ising model with a tilted magnetic field

Abstract

We study a one-dimensional Ising model with a magnetic field and show that tilting the field induces a transition to quantum chaos. We explore the stationary states of this Hamiltonian to show the intimate connection between entanglement and avoided crossings. In general entanglement gets exchanged between the states undergoing an avoided crossing with an overall enhancement of multipartite entanglement at the closest point of approach, simultaneously accompanied by diminishing two-body entanglement as measured by concurrence. We find that both for stationary as well as nonstationary states, nonintegrability leads to a destruction of two-body correlations and distributes entanglement more globally.

Corrections in two figure captions and one new reference. To appear in Phys. Rev. A

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Cited by in corpus (6)

• Direct observation of quantum criticality in Ising spin chains
• Chaos, entanglement and decoherence in the quantum kicked top
• Quantum Chaos, Delocalization, and Entanglement in Disordered Heisenberg Models
• Exact Minimum Eigenvalue Distribution of an Entangled Random Pure State
• Classical bifurcations and entanglement in smooth Hamiltonian system
• Initial-state randomness as a universal source of decoherence