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

  • Authors:

  • Ye-Qi Zhang;Qi-Liang He;Jing-Bo Xu

  • Affiliations:

  • Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou, People's Republic of China 310027 and Department of Mathematics and Physics, North China Electric Power ...;Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou, People's Republic of China 310027;Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou, People's Republic of China 310027

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2013

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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.