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Physics Letters A

Coherence-controlled entanglement and nonlocality of two qubits interacting with a thermal reservoir

Xiang-Ping Liao, Mao-Fa Fang, Zheng Xiao-Juan, Cai Jian-Wu

Published Mar 25, 2007• 15 citations
Publisher
DOI
10.1016/j.physleta.2007.03.039

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Two qubits strongly coupled to a common bosonic reservoir can become entangled with each other, despite having no direct interaction. In equilibrium, such coupling-induced coherences can be described by the mean-force Gibbs state. Here we derive approximate, analytic expressions for the two-qubit mean-force Gibbs state, and use these to characterize equilibrium qubit-qubit entanglement mediated by a thermal reservoir. Entanglement, which is highest at lowest temperatures, is a non-monotonic function of the system-reservoir coupling strength. Moreover, we find that broadening the reservoir spectral density beyond a single mode, as is realistic for typical baths, can enhance the qubit entanglement. Our results provide a comprehensive understanding of reservoir-mediated two-qubit entanglement in thermal equilibrium and provide a benchmark to compare with numerical methods, as well as demonstrating the utility of strong system-reservoir coupling as a resource.