PT-symmetric slowing down of decoherence

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PhysRevA.94.040101.pdf (219.71 KB)

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https://journals.aps.org/pra/abstract/10.1103/PhysRevA.94.040101

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https://doi.org/10.1103/PhysRevA.94.040101
 http://hdl.handle.net/11603/19420

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2016-10-27

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journal articles
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Bartłomiej Gardas, Sebastian Deffner, and Avadh Saxena, Phys. Rev. A 94, 040101(R) (2016), DOI:https://doi.org/10.1103/PhysRevA.94.040101

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©2016 American Physical Society

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Abstract

We investigate PT-symmetric quantum systems ultraweakly coupled to an environment. We find that such open systems evolve under PT-symmetric, purely dephasing and unital dynamics. The dynamical map describing the evolution is then determined explicitly using a quantum canonical transformation. Furthermore, we provide an explanation of why PT-symmetric dephasing-type interactions lead to a critical slowing down of decoherence. This effect is further exemplified with an experimentally relevant system, a PT-symmetric qubit easily realizable, e.g., in optical or microcavity experiments.