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

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Date
02/2022
Author
Gribben, Dominic
Rouse, Dominic M.
Iles-Smith, Jake
Strathearn, Aidan
Maguire, Henry
Kirton, Peter
Nazir, Ahsan
Gauger, Erik M.
Lovett, Brendon W.
Funder
EPSRC
EPSRC
Grant ID
EP/L015110/1
EP/T014032/1
Keywords
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
DAS
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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.
Citation
Gribben , D , Rouse , D M , Iles-Smith , J , Strathearn , A , Maguire , H , Kirton , P , Nazir , A , Gauger , E M & Lovett , B W 2022 , ' Exact dynamics of nonadditive environments in non-Markovian open quantum systems ' , PRX Quantum , vol. 3 , no. 1 , 010321 . https://doi.org/10.1103/PRXQuantum.3.010321
Publication
PRX Quantum
Status
Peer reviewed
DOI
https://doi.org/10.1103/PRXQuantum.3.010321
ISSN
2691-3399
Type
Journal article
Rights
Copyright © 2022 the Authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Description
Funding: D.G. and D.M.R. acknowledge studentship funding from EPSRC (EP/L015110/1). B.W.L. and E.M.G. acknowledge support from EPSRC (grants EP/T014032.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/24958

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