Local vs global dynamics in a dissipative qubit-impurity system
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866908865512079360 |
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| author | Chiatto, Giuseppe Emanuele Chiriacó, Giuliano Paladino, Elisabetta Falci, Giuseppe Antonio |
| author_facet | Chiatto, Giuseppe Emanuele Chiriacó, Giuliano Paladino, Elisabetta Falci, Giuseppe Antonio |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_03834 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Local vs global dynamics in a dissipative qubit-impurity system Chiatto, Giuseppe Emanuele Chiriacó, Giuliano Paladino, Elisabetta Falci, Giuseppe Antonio Quantum Physics 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. |
| title | Local vs global dynamics in a dissipative qubit-impurity system |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.03834 |