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Effects of a phase-damping cavity on entanglement and purity loss in two-qubit system

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Abstract

We analyze two identical qubits interacting with a single-mode quantized radiation field, taking into account the influence of phase damping. The qubits are assumed to be initially in a superposition of the excited and the ground states, and the field is in a coherent state. The effects of the damping on the purity loss of the system and different bipartite partitions of the system [field-two qubits, qubit–(field + qubit)] through the tangles are considered. The effect of the damping on the entanglement of field qubits state is evaluated by the negativity. It is noted that the phenomenon of death and rebirth of the entanglement appears. With the increase in the phase parameter, this phenomenon disappears.

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Acknowledgments

A.-B. A. Mohamed extends his appreciation to the Deanship of Scientific Research at Salman bin Abdulaziz University for funding the work under the research project No. 2014/01/1421.

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Authors and Affiliations

  1. Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt

    A.-S. F. Obada

  2. Faculty of Science, Assiut University, Assiut, Egypt

    H. A. Hessian, A.-B. A. Mohamed & M. Hashem

  3. College of Science and Humanities, Salman Bin Abdulaziz University, Al-Aflaj, Saudi Arabia

    A.-B. A. Mohamed

Authors
  1. A.-S. F. Obada
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  2. H. A. Hessian
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  3. A.-B. A. Mohamed
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  4. M. Hashem
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Correspondence to M. Hashem.

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Obada, AS.F., Hessian, H.A., Mohamed, AB.A. et al. Effects of a phase-damping cavity on entanglement and purity loss in two-qubit system. Quantum Inf Process 14, 2043–2053 (2015). https://doi.org/10.1007/s11128-015-0952-x

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  • DOI: https://doi.org/10.1007/s11128-015-0952-x

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