We consider a simple microscopic model where the open-system dynamics of a qubit, despite being Markovian, shows features which are typically associated to the presence of memory effects. Namely, a non monotonic behavior both in the population and in the coherence evolution arises due to the presence of non-secular contributions, which break the phase covariance of the Lindbladian (semigroup) dynamics. We also show by an explicit construction how such a non-monotonic behaviour can be reproduced by a phase covariant evolution, but only at the price of inserting some state-dependent memory effects.
Non-monotonic Population and Coherence Evolution in Markovian Open-System Dynamics / J.F. Haase, A. Smirne, S.F. Huelga (SPRINGER PROCEEDINGS IN PHYSICS). - In: Advances in Open Systems and Fundamental Tests of Quantum Mechanics / [a cura di] B. Vacchini, H.-P. Breuer, A. Bassi. - [s.l] : Springer, 2019. - ISBN 9783030311452. - pp. 41-57 (( convegno Proceedings of the 684. WE-Heraeus-Seminar tenutosi a Bad Honnef nel 2018 [10.1007/978-3-030-31146-9_4].
Non-monotonic Population and Coherence Evolution in Markovian Open-System Dynamics
A. Smirne;
2019
Abstract
We consider a simple microscopic model where the open-system dynamics of a qubit, despite being Markovian, shows features which are typically associated to the presence of memory effects. Namely, a non monotonic behavior both in the population and in the coherence evolution arises due to the presence of non-secular contributions, which break the phase covariance of the Lindbladian (semigroup) dynamics. We also show by an explicit construction how such a non-monotonic behaviour can be reproduced by a phase covariant evolution, but only at the price of inserting some state-dependent memory effects.File | Dimensione | Formato | |
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