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Effect of one-, two-, and three-body atom loss processes on superpositions of phase states in Bose-Josephson junctions

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Abstract

In a two-mode Bose-Josephson junction formed by a binary mixture of ultracold atoms, macroscopic superpositions of phase states are produced during the time evolution after a sudden quench to zero of the coupling amplitude. Using quantum trajectories and an exact diagonalization of the master equation, we study the effect of one-, two-, and three-body atom losses on the superpositions by analyzing separately the amount of quantum correlations in each subspace with fixed atom number. The quantum correlations useful for atom interferometry are estimated using the quantum Fisher information. We identify the choice of parameters leading to the largest Fisher information, thereby showing that, for all kinds of loss processes, quantum correlations can be partially protected from decoherence when the losses are strongly asymmetric in the two modes.

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Author information

Authors and Affiliations

  1. Institut Fourier, Univ. Grenoble Alpes and CNRS, 38000, Grenoble, France

    Dominique Spehner

  2. LPMMC, Univ. Grenoble Alpes, 38000, Grenoble, France

    Dominique Spehner & Anna Minguzzi

  3. LPMMC, CNRS, 38000, Grenoble, France

    Dominique Spehner & Anna Minguzzi

  4. Center for Theoretical Physics PAN, 02-668, Warsaw, Poland

    Krzysztof Pawlowski

  5. Physikalisches Institut, Universität Stuttgart, 70569, Stuttgart, Germany

    Krzysztof Pawlowski

  6. Laboratoire Kastler Brossel, Ecole Normale Supérieure, 75231, Paris, France

    Krzysztof Pawlowski

  7. Laboratoire Kastler Brossel, Université Pierre et Marie Curie, 75000, Paris, France

    Giulia Ferrini

Authors
  1. Dominique Spehner
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  2. Krzysztof Pawlowski
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  3. Giulia Ferrini
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  4. Anna Minguzzi
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Correspondence to Dominique Spehner.

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Spehner, D., Pawlowski, K., Ferrini, G. et al. Effect of one-, two-, and three-body atom loss processes on superpositions of phase states in Bose-Josephson junctions. Eur. Phys. J. B 87, 157 (2014). https://doi.org/10.1140/epjb/e2014-50066-8

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  • DOI: https://doi.org/10.1140/epjb/e2014-50066-8

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