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Erschienen in: Quantum Information Processing 7/2019

01.07.2019

Decoherence of a two-level system interacting with a disturbed Ohmic reservoir

verfasst von: Masashi Ban

Erschienen in: Quantum Information Processing | Ausgabe 7/2019

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Abstract

Reduced time evolution of a two-level system is studied by means of an exactly solvable dephasing model. It is assumed that the two-level system is influenced by a disturbed Ohmic reservoir which is out of thermal equilibrium. The disturbance is caused by an interaction between a thermal reservoir and an ancillary two-level system before a system of interest interacts with the thermal reservoir. It is shown that the reduced time evolution of the two-level system can be non-Markovian even when it is Markovian in the absence of the disturbance. This means that the disturbance in the thermal reservoir can induce the non-Markovian time evolution of the two-level system. Dependence of the reduced time evolution on system-reservoir coupling strength, Ohmicity parameter, and reservoir temperature is examined in terms of coherence measure and trace distance.

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Metadaten
Titel
Decoherence of a two-level system interacting with a disturbed Ohmic reservoir
verfasst von
Masashi Ban
Publikationsdatum
01.07.2019
Verlag
Springer US
Erschienen in
Quantum Information Processing / Ausgabe 7/2019
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-019-2337-z

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