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Entanglement sudden death in band gaps

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Abstract

Using the pseudomode method, we evaluate exactly time-dependent entanglement for two independent qubits, each coupled to a non-Markovian structured environment. Our results suggest a possible way to retard entanglement sudden death by modifying the qubit-pseudomode detuning and the spectrum of the reservoirs. Particularly, in environments structured by a model of a density-of-states gap which has two poles, entanglement trapping and prevention of entanglement sudden death occur in the weak-coupling regime.

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Authors and Affiliations

  1. Department of Physics, Qufu Normal University, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu, 273165, People’s Republic of China

    Y. J. Zhang, Z. X. Man & Y. J. Xia

  2. Department of Physics, University of Science and technology of China, Key Laboratory of Quantum Information, Hefei, 230026, People’s Republic of China

    G. C. Guo

Authors
  1. Y. J. Zhang
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  2. Z. X. Man
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  3. Y. J. Xia
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  4. G. C. Guo
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Correspondence to Y. J. Xia.

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Zhang, Y., Man, Z., Xia, Y. et al. Entanglement sudden death in band gaps. Eur. Phys. J. D 58, 397–401 (2010). https://doi.org/10.1140/epjd/e2010-00087-6

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  • DOI: https://doi.org/10.1140/epjd/e2010-00087-6

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