Local vs global dynamics in a dissipative qubit-impurity system
Quantum Physics
2026-03-05 v1
Abstract
We analyse the dynamics of a qubit coupled to a dissipative impurity by comparing local and global derivation schemes of a Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) master equation within the Born-Markov and full secular (FS) approximations. We show that the local approach correctly captures a crossover in the dynamics of the qubit coherence, while the FS approximation restricts the validity of the global approach to regimes with well-separated energy scales. Our results clarify the domains of validity of the two approaches and show that the local scheme provides a better GKSL description of the qubit dynamics in the experimentally relevant parameter regime.
Keywords
Cite
@article{arxiv.2603.03834,
title = {Local vs global dynamics in a dissipative qubit-impurity system},
author = {Giuseppe Emanuele Chiatto and Giuliano Chiriacó and Elisabetta Paladino and Giuseppe Antonio Falci},
journal= {arXiv preprint arXiv:2603.03834},
year = {2026}
}
Comments
4 pages, 1 figure