Entanglement of a 2-qubit system coupled to a bath of quantum spin glass

C.Y. Koh and L.C. Kwek

Physica A: Statistical Mechanics and its Applications, 2014, vol. 403, issue C, 54-64

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.

Keywords: Spin glass; Spin chain; Entanglement (search for similar items in EconPapers)
Date: 2014
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:403:y:2014:i:c:p:54-64

DOI: 10.1016/j.physa.2014.02.017

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