Entanglement dynamics of two qubits coupled by Heisenberg XY interaction under a nonuniform magnetic field in a spin bath

doi:10.1088/1674-1056/20/8/080302

Abstract This paper investigates the entanglement dynamics of a Heisenberg XY model for a two-spin system in the presence of a nonuniform magnetic field. The master equations and the concurrence evolution equations for the initial α state are derived and analysed. It is shown that for the symmetric initial α state, only the nonuniform field can play a role in entanglement dynamics while the uniform field and the bath will not play such a role. For the asymmetric α state, the nonuniform field leads to the beat pattern oscillation of the concurrence evolution. The inhomogeneity of the field can enhance the entanglement by suppressing the decoherence effects of both the spin—orbit interaction and the spin bath.

Keywords: quantum entanglement decoherence qubits Heisenberg model

Received: 24 February 2011
Revised: 16 March 2011
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	42.50.Dv	(Quantum state engineering and measurements)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10874194, 60978013, and 60921004) and the International Cooperation Program from Science and Technology Commission of Shanghai Municipality (Grant No. 10530704800).

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Zhou Feng-Xue(周凤雪), Zhang Li-Da(张理达), Qi Yi-Hong(祁义红), Niu Yue-Ping(钮月萍), Zhang Jing-Tao(张敬涛), and Gong Shang-Qing(龚尚庆) Entanglement dynamics of two qubits coupled by Heisenberg XY interaction under a nonuniform magnetic field in a spin bath 2011 Chin. Phys. B 20 080302

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Entanglement dynamics of two qubits coupled by Heisenberg XY interaction under a nonuniform magnetic field in a spin bath

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