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Does “cooling by heating” protect quantum correlations?

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Abstract

The connection between nonequilibrium quantum correlations, such as entanglement and quantum discord, and cooling by heating is investigated for a system composed by two atoms interacting with a single electromagnetic mode of a lossy cavity. This Hamiltonian model is experimentally feasible in the quantum optics domain and presents the occurrence of both nonequilibrium quantum correlations and cooling by heating for a range of parameters. Since in the cooling by heating phenomenon the effective temperature of the system decreases even increasing the environments temperature, it could be expected that quantum correlations could be enhanced. Interestingly, for some parameters we show that, contrary to this expectation, in the case studied here the lowering of the system effective temperature leads to no enhancement in the quantum correlations. In addition, we found that at both zero and finite temperature, depending on the parameters used, quantum correlations can be enhanced even when increasing the damping rates, a somewhat counterintuitive result.

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Acknowledgments

We acknowledge financial support from the Brazilian agency CNPq, CAPES, and FAPEG. C.J.V.-B. also acknowledges financial support from São Paulo Research Foundation (FAPESP)—Grant No. 2013/04162-5. This work was performed as part of the Brazilian National Institute of Science and Technology (INCT) for Quantum Information. A.X. thanks the Universidade Federal de Goiás for its kind hospitality.

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Authors and Affiliations

  1. Departamento de Física, Universidade Federal de São Carlos, São Carlos, São Paulo, 13565-905, Brazil

    C. J. Villas-Boas

  2. Instituto de Física, Universidade Federal de Goiás, Goiânia, Goiás, 74690-900, Brazil

    W. B. Cardoso, A. T. Avelar & N. G. de Almeida

  3. Department of Physics, University of Malta, Msida, MSD 2080, Malta

    A. Xuereb

  4. Centre for Theoretical Atomic, Molecular, and Optical Physics, School of Mathematics and Physics, Queen’s University Belfast, Belfast, BT7 1NN, UK

    A. Xuereb

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  1. C. J. Villas-Boas
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  2. W. B. Cardoso
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  3. A. T. Avelar
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  4. A. Xuereb
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  5. N. G. de Almeida
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Correspondence to W. B. Cardoso.

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Villas-Boas, C.J., Cardoso, W.B., Avelar, A.T. et al. Does “cooling by heating” protect quantum correlations?. Quantum Inf Process 15, 2021–2032 (2016). https://doi.org/10.1007/s11128-016-1254-7

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  • DOI: https://doi.org/10.1007/s11128-016-1254-7

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