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Correlation-Picture approach to open-quantum-system dynamics
, Article Physical Review X ; Volume 10, Issue 4 , 2020 ; Rezakhani, A. T ; Babu, A. P ; Mølmer, K ; Möttönen, M ; Ala-Nissila, T ; Sharif University of Technology
American Physical Society
2020
Abstract
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...