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Title: Linear-algebraic bath transformation for simulating complex open quantum systems

Journal Article · · New Journal of Physics
 [1];  [1];  [1];  [2];  [1]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Tsinghua Univ., Beijing (China)

In studying open quantum systems, the environment is often approximated as a collection of non-interacting harmonic oscillators, a configuration also known as the star-bath model. It is also well known that the star-bath can be transformed into a nearest-neighbor interacting chain of oscillators. The chain-bath model has been widely used in renormalization group approaches. The transformation can be obtained by recursion relations or orthogonal polynomials. Based on a simple linear algebraic approach, we propose a bath partition strategy to reduce the system-bath coupling strength. As a result, the non-interacting star-bath is transformed into a set of weakly coupled multiple parallel chains. Furthermore, the transformed bath model allows complex problems to be practically implemented on quantum simulators, and it can also be employed in various numerical simulations of open quantum dynamics.

Research Organization:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Center for Excitonics (CE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001088
OSTI ID:
1210677
Journal Information:
New Journal of Physics, Vol. 16, Issue 12; Related Information: CE partners with Massachusetts Institute of Technology (lead); Brookhaven National Laboratory; Harvard University; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (9)

Hierarchical Equations for Open System Dynamics in Fermionic and Bosonic Environments journal March 2015
Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model journal April 2017
Universal bound on sampling bosons in linear optics and its computational implications journal April 2019
Pseudomodes and the corresponding transformation of the temperature-dependent bath correlation function journal May 2015
Electron pumping in the strong coupling and non-Markovian regime: A reaction coordinate mapping approach journal July 2019
Hierarchical equations for open system dynamics in fermionic and bosonic environments text January 2014
Pseudomodes and the corresponding transformation of the temperature-dependent bath correlation function text January 2015
Fermionic reaction coordinates and their application to an autonomous Maxwell demon in the strong coupling regime text January 2017
Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model text January 2017