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

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  • Koh, C.Y.
  • Kwek, L.C.

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.

Suggested 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, Elsevier, vol. 403(C), pages 54-64.
    • Handle: RePEc:eee:phsmap:v:403:y:2014:i:c:p:54-64
    DOI: 10.1016/j.physa.2014.02.017
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    Cited by:

    1. Li, Wenlin & Li, Chong & Song, Heshan, 2016. "Realization of quantum information processing in quantum star network constituted by superconducting hybrid systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 463(C), pages 427-436.
    2. Koh, C.Y. & Kwek, L.C., 2015. "Entanglement witness for spin glass," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 420(C), pages 324-330.

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