Non-equilibrium quantum probing through linear response

The formalism of linear response theory can be extended to encompass physical situations where an open quantum system evolves towards a non-equilibrium steady-state. Here, we use the framework put forward by Konopik and Lutz [Phys. Rev. Research {\bf 1}, 033156 (2019)] to go beyond unitary perturbat...

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Published inarXiv.org
Main Authors Blair, Sherry, Zicari, Giorgio, Belenchia, Alessio, Ferraro, Alessandro, Paternostro, Mauro
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 13.02.2024
Subjects
Harmonic oscillators
Open systems
Perturbation
Physics - Quantum Physics
Physics - Statistical Mechanics
Quantum theory
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Summary:The formalism of linear response theory can be extended to encompass physical situations where an open quantum system evolves towards a non-equilibrium steady-state. Here, we use the framework put forward by Konopik and Lutz [Phys. Rev. Research {\bf 1}, 033156 (2019)] to go beyond unitary perturbations of the dynamics. Considering an open system comprised of two coupled quantum harmonic oscillators, we study the system's response to unitary perturbations, affecting the Hamiltonian dynamics, as well as non-unitary perturbations, affecting the properties of the environment, e.g., its temperature and squeezing. We show that linear response, combined with a quantum probing approach, can effectively provide valuable quantitative information about the perturbation and characteristics of the environment, even in cases of non-unitary dynamics.
ISSN:2331-8422
DOI:10.48550/arxiv.2306.08500