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Simulation of open quantum systems by automated compression of arbitrary environments

Titelangaben

Cygorek, Moritz ; Cosacchi, Michael ; Vagov, Alexei ; Axt, Vollrath Martin ; Lovett, Brendon W. ; Keeling, Jonathan ; Gauger, Erik M.:
Simulation of open quantum systems by automated compression of arbitrary environments.
In: Nature Physics. Bd. 18 (2022) . - S. 662-668.
ISSN 1745-2473
DOI: https://doi.org/10.1038/s41567-022-01544-9

Volltext

Link zum Volltext (externe URL): Volltext

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft
Russian Science Foundation, Project 18-12-00429 and Basic Research Program at the HSE University. EPSRC grant no. EP/T01377X/1 and EPSRC grant no. EP/T014032/1.

Abstract

Studies of the dynamics of open quantum systems are limited by the large Hilbert space of typical environments, which is too large to be treated exactly. In some cases, approximate descriptions of the system are possible, for example, when the environment has a short memory time or only interacts weakly with the system. Accurate numerical methods exist, but these are typically restricted to baths with Gaussian correlations, such as non-interacting bosons. Here we present a method for simulating open quantum systems with arbitrary environments that consist of a set of independent degrees of freedom. Our approach automatically reduces the large number of environmental degrees of freedom to those which are most relevant. Specifically, we show how the process tensor describing the effect of the environment can be iteratively constructed and compressed using matrix product state techniques. We demonstrate the power of this method by applying it to a range of open quantum systems, including bosonic, fermionic and spin environments. The versatility and efficiency of our automated compression of environments method provides a practical general-purpose tool for open quantum systems.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: open quantum systems; path integral methods; numerical exact algorithm; matrix product technique; process tensor calculation; general simulation method
Fachklassifikationen: condensed matter physics (theoretical)
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 12 Aug 2022 05:51
Letzte Änderung: 12 Aug 2022 05:51
URI: https://eref.uni-bayreuth.de/id/eprint/71450