Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/17769
Title: Entanglement of a 2-qubit system coupled to a bath of quantum spin glass
Authors: Koh, Chee Yeong
Kwek, Leong Chuan
Issue Date: 2014
Citation: Koh, C. Y., & Kwek, L. C. (2014). Entanglement of a 2-qubit system coupled to a bath of quantum spin glass. Physica A: Statistical Mechanics and its Applications, 403, 54-64. http://dx.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.
Description: This is the final draft, after peer-review, of a manuscript published in Physica A: Statistical Mechanics and its Applications. The published version is available online at http://dx.doi.org/10.1016/j.physa.2014.02.017
URI: http://hdl.handle.net/10497/17769
ISSN: 0378-4371
Other Identifiers: 10.1016/j.physa.2014.02.017
Appears in Collections:Journal Articles

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