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Entanglement Dynamics in a Model Tripartite Quantum System

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Abstract

A Λ-type atom interacting with two radiation fields exhibits electromagnetically induced transparency and other nonclassical effects that appear in the entanglement dynamics of the atomic subsystem and in appropriate field observables. Both EIT and field-atom entanglement are important for quantum information processing. We investigate the roles played by specific initial field states, detuning parameters, field nonlinearities and intensity-dependent field-atom couplings on EIT and the entanglement between subsystems. Departure from coherence of the initial field states produces significant effects. We investigate these aspects in a model that exhibits the salient features of entangled tripartite systems. For initial photon-added coherent states, collapses and revivals of the atomic subsystem von Neumann entropy appear as the intensity parameter varies over a narrow range of values. These features could be useful in enabling entanglement.

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Authors and Affiliations

  1. IIT Madras, Chennai, 600036, India

    Pradip Laha, B. Sudarsan, S. Lakshmibala & V. Balakrishnan

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  1. Pradip Laha
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  2. B. Sudarsan
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  3. S. Lakshmibala
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  4. V. Balakrishnan
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Correspondence to S. Lakshmibala.

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Laha, P., Sudarsan, B., Lakshmibala, S. et al. Entanglement Dynamics in a Model Tripartite Quantum System. Int J Theor Phys 55, 4044–4059 (2016). https://doi.org/10.1007/s10773-016-3033-8

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  • DOI: https://doi.org/10.1007/s10773-016-3033-8

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