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Quantum Information Processing

Steady-state entanglement and thermalization of coupled qubits in two common heat baths

  • 01-03-2018
Published in:
Authors
Li-Zhen Hu
Zhong-Xiao Man
Yun-Jie Xia
Published in
Quantum Information Processing | Issue 3/2018

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Abstract

In this work, we study the steady-state entanglement and thermalization of two coupled qubits embedded in two common baths with different temperatures. The common bath is relevant when the two qubits are difficult to be isolated to only contact with their local baths. With the quantum master equation constructed in the eigenstate representation of the coupled qubits, we have demonstrated the variations of steady-state entanglement with respect to various parameters of the qubits’ system in both equilibrium and nonequilibrium cases of the baths. The coupling strength and energy detuning of the qubits as well as the temperature gradient of the baths are found to be beneficial to the enhancement of the entanglement. We note a dark state of the qubits that is free from time-evolution and its initial population can greatly influence the steady-state entanglement. By virtues of effective temperatures, we also study the thermalization of the coupled qubits and their variations with energy detuning.

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Title
Steady-state entanglement and thermalization of coupled qubits in two common heat baths
Authors
Li-Zhen Hu
Zhong-Xiao Man
Yun-Jie Xia
Publication date
01-03-2018
Publisher
Springer US
Published in
Quantum Information Processing / Issue 3/2018
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-018-1825-x
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