Non-Markovian entanglement dynamics of two spin-1/2 particles embedded in
two separate spin star baths with tunable external magnetic fields |
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Authors: | X Xiao M F Fang Y L Li G D Kang and C Wu |
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Institution: | 1.Key Laboratory of Low-Dimensional Quantum Structures and Quantum
Control, Ministry of Education, and College of Physics and
Information Science, Hunan Normal University,Changsha,P.R. China |
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Abstract: | The exact entanglement dynamics of two spin qubits in two
independent spin star baths via a Heisenberg XY interaction in the
thermodynamic limit has been investigated by using an operator
technique. After the Holstein-Primakoff transformation, the
transformed Hamiltonian is effectively equivalent to the Hamiltonian
of a Jaynes-Cummings model. The results show that the dynamics of
the entanglement exhibits strong non-Markovian behavior and depends
on the environmental temperature, the coupling strength between the
center spin and the bath, the detuning controlled by a locally
applied external magnetic field, as well as the initial state of the
two qubits. |
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Keywords: | |
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