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Quantum discord for two-qubit systems in the Bloch channel: effects of longitudinal and transversal relaxation times

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Abstract

Quantum discord is studied for two-qubit systems with different settings under the influence of the Bloch channel which is characterized by the longitudinal and transversal relaxation times and the environmental temperature. The relaxation of the quantum discord strongly depends on the ratio of the two relaxation times and the environmental temperature. It is found that the ratio of the quantum discord to the total correlation becomes finite or zero asymptotically, depending on the ratio of the relaxation times and the system setting. Furthermore, the optimal setting for sharing the quantum discord is discussed for given environmental temperature and ratio of the relaxation times.

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Authors and Affiliations

  1. Graduate School of Humanities and Sciences, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo, 112-8610, Japan

    Ikumi Kondo & Masashi Ban

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  1. Ikumi Kondo
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  2. Masashi Ban
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Correspondence to Masashi Ban.

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Kondo, I., Ban, M. Quantum discord for two-qubit systems in the Bloch channel: effects of longitudinal and transversal relaxation times. Quantum Inf Process 16, 196 (2017). https://doi.org/10.1007/s11128-017-1651-6

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  • DOI: https://doi.org/10.1007/s11128-017-1651-6

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