Taming the Bloch-Redfield equation: Recovering an accurate Lindblad equation for general open quantum systems
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916419709435904 |
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| author | de la Pradilla, Diego Fernández Moreno, Esteban Feist, Johannes |
| author_facet | de la Pradilla, Diego Fernández Moreno, Esteban Feist, Johannes |
| contents | Master equations play a pivotal role in investigating open quantum systems. In particular, the Bloch-Redfield equation stands out due to its relation to a concrete physical environment. However, without further approximations it does not lead to a Lindblad master equation that guarantees that the density matrix stays completely positive, which has raised some concerns regarding its use. This study builds on previous efforts to transform the Bloch-Redfield framework into a mathematically robust Lindblad equation, while fully preserving the effects that are lost within the secular approximation that is commonly used to guarantee positivity. These previous approaches introduce two potential deficiencies: the environment-induced energy shift can be non-Hermitian and some decay rates can be negative, violating the assumptions of Lindblad's theorem. Here, we propose and evaluate straightforward solutions to both problems. Our approach offers an effective and general procedure for obtaining a Lindblad equation, derived from a concrete physical environment, while mitigating the unphysical dynamics present in the Bloch-Redfield equation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_06354 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Taming the Bloch-Redfield equation: Recovering an accurate Lindblad equation for general open quantum systems de la Pradilla, Diego Fernández Moreno, Esteban Feist, Johannes Quantum Physics Master equations play a pivotal role in investigating open quantum systems. In particular, the Bloch-Redfield equation stands out due to its relation to a concrete physical environment. However, without further approximations it does not lead to a Lindblad master equation that guarantees that the density matrix stays completely positive, which has raised some concerns regarding its use. This study builds on previous efforts to transform the Bloch-Redfield framework into a mathematically robust Lindblad equation, while fully preserving the effects that are lost within the secular approximation that is commonly used to guarantee positivity. These previous approaches introduce two potential deficiencies: the environment-induced energy shift can be non-Hermitian and some decay rates can be negative, violating the assumptions of Lindblad's theorem. Here, we propose and evaluate straightforward solutions to both problems. Our approach offers an effective and general procedure for obtaining a Lindblad equation, derived from a concrete physical environment, while mitigating the unphysical dynamics present in the Bloch-Redfield equation. |
| title | Taming the Bloch-Redfield equation: Recovering an accurate Lindblad equation for general open quantum systems |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2402.06354 |