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Quantum Discord for Two-Qubit System in a Symmetry-Broken Environment

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Abstract

In contrast with the entanglement, we study the quantum discord dynamics of the two-qubit system in a symmetry-broken environment consisting of a fermionic bath. The quantum discord decay induced by the bath is analysed. By considering the two qubits that are initially prepared in the different X-states, we find that the behaviors of quantum discord and entanglement are different, the robustness of quantum discord depends on the initial state prepared in.

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Acknowledgements

This work was partially supported by the CNSF (grant No. 60703100, and No. 10575017) and the Fundamental Research Funds for the Central Universities No. DUT10LK10.

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Authors and Affiliations

  1. School of Science, Liaoning University of Science and Technology, Anshan, 114051, China

    Jing Nie & Xiuyi Yang

  2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, China

    Chong Li

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  1. Jing Nie
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  2. Xiuyi Yang
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  3. Chong Li
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Correspondence to Jing Nie.

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Nie, J., Yang, X. & Li, C. Quantum Discord for Two-Qubit System in a Symmetry-Broken Environment. Int J Theor Phys 51, 3637–3646 (2012). https://doi.org/10.1007/s10773-012-1250-3

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  • DOI: https://doi.org/10.1007/s10773-012-1250-3

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