PhysRevX.10.041024.pdf (631.69 kB)
Correlation-picture approach to open-quantum-system dynamics
journal contribution
posted on 2020-11-18, 16:36 authored by S Alipour, AT Rezakhani, AP Babu, K Mølmer, M Möttönen, Tapio Ala-NissilaTapio Ala-NissilaWe 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.
History
School
- Science
Department
- Mathematical Sciences
Published in
Physical Review XVolume
10Issue
4Publisher
American Physical SocietyVersion
- VoR (Version of Record)
Rights holder
© The AuthorsPublisher statement
This is an Open Access Article. It is published by the American Physical Society under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/Acceptance date
2020-09-01Publication date
2020-11-03Copyright date
2020ISSN
2160-3308eISSN
2160-3308Publisher version
Language
- en