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

J. Karthik, Auditya Sharma, and Arul Lakshminarayan

Phys. Rev. A 75, 022304 – Published 6 February 2007

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.

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Received 28 November 2006

DOI:https://doi.org/10.1103/PhysRevA.75.022304

Authors & Affiliations

J. Karthik^*, Auditya Sharma^†, and Arul Lakshminarayan^‡

Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India

^*Present address: Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, IL 61801, USA. Electronic address: kjambun2@uiuc.edu
^†Present address: Department of Physics, University of California, Santa Cruz, CA 95064, USA. Electronic address: sharma@physics.ucsc.edu
^‡Electronic address: arul@physics.iitm.ac.in

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Issue

Vol. 75, Iss. 2 — February 2007

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