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Correlation-Picture Approach to Open-Quantum-System Dynamics
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en
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11
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Physical Review X, Volume 10, issue 4
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 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.
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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