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Regulation of Entanglement and Geometric Quantum Discord of Hybrid Superconducting Qubits for Circuit QED

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Abstract

We investigate the dynamic evolution behaviors of entanglement and geometric quantum discord (GQD) of hybrid qubits in a circuit QED system. Under certain initial conditions, interactions between qubits and that between the qubit and the cavity can suppress the decay of entanglement and GQD of qubits. Under the initial condition |ψ Q (0)〉 I =sinα|↓↑〉+cosα|↑↓〉, such decay was avoided by increasing the coupling strength ratio between qubits and that between the qubit and the cavity. Under the aforementioned condition, the survival time of entanglement and GQD was prolonged by decreasing the coupling strength ratio between qubits and that between the qubit and the cavity.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant No. 11164009.

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Authors and Affiliations

  1. Department of Physics, Jiangxi Normal University, Nanchang, Jiangxi, 330022, China

    Ying-Hua Ji

  2. Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province, Nanchang, Jiangxi, 330022, China

    Ying-Hua Ji

  3. College of Mathematics and Information Science of Jiangxi Normal University, Nanchang, Jiangxi, 330022, China

    Yong-Mei Liu

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  1. Ying-Hua Ji
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  2. Yong-Mei Liu
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Correspondence to Ying-Hua Ji.

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Ji, YH., Liu, YM. Regulation of Entanglement and Geometric Quantum Discord of Hybrid Superconducting Qubits for Circuit QED. Int J Theor Phys 52, 3220–3228 (2013). https://doi.org/10.1007/s10773-013-1617-0

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  • DOI: https://doi.org/10.1007/s10773-013-1617-0

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