Exact dynamics of nonadditive environments in non-Markovian open quantum systems

Gribben, Dominic and Rouse, Dominic M. and Iles-Smith, Jake and Strathearn, Aidan and Maguire, Henry and Kirton, Peter and Nazir, Ahsan and Gauger, Erik M. and Lovett, Brendon W. (2022) Exact dynamics of nonadditive environments in non-Markovian open quantum systems. PRX Quantum, 3 (1). 010321. ISSN 2691-3399 (https://doi.org/10.1103/PRXQuantum.3.010321)

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Abstract

When a quantum system couples strongly to multiple baths, then it is generally no longer possible to describe the resulting system dynamics by simply adding the individual effects of each bath. However, capturing such multibath system dynamics typically requires approximations that can obscure some of the nonadditive effects. Here we present a numerically exact and efficient technique for tackling this problem that builds on the time-evolving matrix product operator (TEMPO) representation. We test the method by applying it to a simple model system that exhibits nonadditive behavior: a two-level dipole coupled to both a vibrational and an optical bath. Although not directly coupled, there is an effective interaction between the baths mediated by the system that can lead to population inversion in the matter system when the vibrational coupling is strong. We benchmark and validate multibath TEMPO against two approximate methods—one based on a polaron transformation, the other on an identification of a reaction coordinate—before exploring the regime of simultaneously strong vibrational and optical coupling where the approximate techniques break down. Here we uncover a new regime where the quantum Zeno effect leads to a fully mixed state of the electronic system.

  • Item type:Article
    ID code:79554
    Dates:
    Date
    Event
    7 February 2022
    Published
    7 January 2022
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:10 Feb 2022 15:16
    Last modified:15 Apr 2024 21:57
    URI:https://strathprints.strath.ac.uk/id/eprint/79554
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