A time-dependent regularization of the Redfield equation
Antonio D'Abbruzzo, Vasco Cavina, Vittorio Giovannetti
SciPost Phys. 15, 117 (2023) · published 27 September 2023
- doi: 10.21468/SciPostPhys.15.3.117
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Abstract
We introduce a new regularization of the Redfield equation based on a replacement of the Kossakowski matrix with its closest positive semidefinite neighbor. Unlike most of the existing approaches, this procedure is capable of retaining the time dependence of the Kossakowski matrix, leading to a completely positive divisible quantum process. Using the dynamics of an exactly-solvable three-level open system as a reference, we show that our approach performs better during the transient evolution, if compared to other approaches like the partial secular master equation or the universal Lindblad equation. To make the comparison between different regularization schemes independent from the initial state, we introduce a new quantitative approach based on the Choi-Jamiołkowski isomorphism.
Cited by 8
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- Fonds National de la Recherche Luxembourg [FNR]
- Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR) (through Organization: Ministero dell'Istruzione, dell'Università e della Ricerca / Ministry of Education, Universities and Research [MIUR])