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Enhancing quantum discord in superconducting qubit systems by a controllable electromagnetic field

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Abstract

We study the dynamics of quantum correlations of the systems consisting of two non-interacting superconducting qubits interacting with their own data bus and common data bus, where the qubits are driven by a controllable time-dependent electromagnetic field. We investigate how the time-dependent electromagnetic field affects the dynamics of the quantum discord and the three-partite entanglement of the systems. It is found that the quantum discord vanishes only asymptotically although entanglement disappears suddenly during the time evolution and the quantum discord between two qubits can be increased by adjusting the time-dependent electromagnetic field.

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Authors and Affiliations

  1. Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Ye-Qi Zhang, Qi-Liang He & Jing-Bo Xu

  2. Department of Mathematics and Physics, North China Electric Power University, Beijing, 102206, People’s Republic of China

    Ye-Qi Zhang

Authors
  1. Ye-Qi Zhang
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  2. Qi-Liang He
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  3. Jing-Bo Xu
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Correspondence to Jing-Bo Xu.

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Zhang, YQ., He, QL. & Xu, JB. Enhancing quantum discord in superconducting qubit systems by a controllable electromagnetic field. Quantum Inf Process 12, 1335–1350 (2013). https://doi.org/10.1007/s11128-012-0476-6

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  • DOI: https://doi.org/10.1007/s11128-012-0476-6

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