Correlation-Picture Approach to Open-Quantum-System Dynamics

We introduce a dynamical picture, referred to as correlation picture, which connects a correlated bipartite state to its uncorrelated counterpart. This picture allows us to derive an exact dynamical equation for a general open-system dynamics with system-environment correlations included. This exact dynamics is in the form of a Lindblad-like equation even in the presence of initial system-environment correlations. For explicit calculations, we also develop a weak-correlation expansion that allows us to introduce systematic perturbative approximations. This expansion provides approximate master equations that can feature advantages over existing weak-coupling techniques. As a special case, we derive a Markovian master equation, which is different from existing approaches. We compare our equations with corresponding standard weak-coupling equations using two examples, for which our correlation-picture formalism is more accurate, or at least as accurate as the weak-coupling equations.

DOI

10.1103/PhysRevX.10.041024

Citation

Alipour, S, Rezakhani, A T, Babu, A P, Mølmer, K, Möttönen, M & Ala-Nissila, T 2020, ' Correlation-Picture Approach to Open-Quantum-System Dynamics ', Physical Review X, vol. 10, no. 4, 041024 . https://doi.org/10.1103/PhysRevX.10.041024

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-2020113020570

Collections

[article-cris] Perustieteiden korkeakoulu / SCI

Show all metadata

Correlation-Picture Approach to Open-Quantum-System Dynamics

Access rights

URL

Journal Title

Journal ISSN

Volume Title

Authors

Date

Department

Major/Subject

Mcode

Degree programme

Language

Pages

Series

Abstract

Description

Keywords

Other note

DOI

Citation

Permanent link to this item

Collections