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

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

2006-11-24

arxiv.org/abs/quant-ph/0611248v2

Phys. Rev. A 75, 022304 (2007)

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevA.75.022304

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.

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