Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.physa.2014.02.017
Title: Entanglement of a 2-qubit system coupled to a bath of quantum spin glass
Authors: Koh, C.Y.
Kwek, L.C. 
Keywords: Entanglement
Spin chain
Spin glass
Issue Date: 1-Jun-2014
Source: Koh, C.Y., Kwek, L.C. (2014-06-01). Entanglement of a 2-qubit system coupled to a bath of quantum spin glass. Physica A: Statistical Mechanics and its Applications 403 : 54-64. ScholarBank@NUS Repository. https://doi.org/10.1016/j.physa.2014.02.017
Abstract: We study the quantum entanglement (concurrence) of a 2-qubit system coupled to a small spin glass bath of 2 to n≥ 4 qubits. The bath is described by the quantum XX Heisenberg model with random J coupling and varying magnetic field h. We look at the dynamics of the steady state average concurrence for the system and obtain a general formula to describe the concurrence with J=0 and h=0 for n bath sites. The physics of 2-qubit system coupled with n bath sites for J=0 is analytically described for small n. The result for large n was numerically found to be qualitatively similar. For small fluctuation in J, a mean steady state average concurrence of about 0.5 is obtained. © 2014 Elsevier B.V. All rights reserved.
Source Title: Physica A: Statistical Mechanics and its Applications
URI: http://scholarbank.nus.edu.sg/handle/10635/112430
ISSN: 03784371
DOI: 10.1016/j.physa.2014.02.017
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