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Open Quantum Systems Decoherence

Local vs global dynamics in a dissipative qubit-impurity system

arXiv
Authors: Giuseppe Emanuele Chiatto, Giuliano Chiriacó, Elisabetta Paladino, Giuseppe Antonio Falci

Year

2026

Paper ID

25851

Status

Preprint

Abstract Read

~2 min

Abstract Words

99

Citations

N/A

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.

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  • 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...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2603.03834 [2] arXiv https://arxiv.org/abs/2603.03834 [3] Publisher https://arxiv.org/abs/2603.03834

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