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Decoherence of interacting qubits in contact with a common environment

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Abstract

Decoherence of interacting two qubits placed under the influence of a common environment is studied by means of the quantum master equation, where the two qubits interact with each other via the XY-coupling and the two-qubit system has the dephasing coupling with the environment. It is shown that when the asymmetry of the interaction between the two-qubit system and environment is not small, the qubit-qubit interaction significantly affects the dephasing of the two-qubit system. To examine such an interaction effect, the decay of two-qubit entanglement is calculated. It is found that the qubit-qubit interaction makes not only the decay of entanglement small but also the period of the oscillatory behaviour short.

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Authors and Affiliations

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

    M. Ban

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  1. M. Ban
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Correspondence to M. Ban.

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Ban, M. Decoherence of interacting qubits in contact with a common environment. Eur. Phys. J. D 58, 415–421 (2010). https://doi.org/10.1140/epjd/e2010-00108-6

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  • DOI: https://doi.org/10.1140/epjd/e2010-00108-6

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