Dissipative evolution of a two-level system through a geometry-based classical mapping

• URL: http://arxiv.org/abs/2501.03760v1
• Date: Tue, 07 Jan 2025 13:02:24 GMT
• Title: Dissipative evolution of a two-level system through a geometry-based classical mapping
• Authors: Daniel Martínez Gil, Pedro Bargueño, Salvador Miret-Artés,
• Abstract summary: We study the dynamics of both isolated and interacting two-level systems. Our model turns an isolated symmetric two-level system into an environment-assisted asymmetric one.
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• Abstract: In this manuscript, we introduce a geometry-based formalism to obtain a Meyer-Miller-Stock-Thoss mapping in order to study the dynamics of both isolated and interacting two-level systems. After showing the description of the isolated case using canonically conjugate variables, we implement an interaction model by bilinearly coupling the corresponding population differences {\it \`a la} Caldeira-Leggett, showing that the dynamics behave as a Gross-Pitaevskii-like one. We also find a transition between oscillatory and tunneling-suppressed dynamics that can be observed by varying the coupling constant. After extending our model to the {\it system plus environment} case, where the environment is considered as a collection of two-level systems, we show tunneling-suppressed dynamics in the strong coupling limit and the usual damping effect similar to that of a harmonic oscillator bath in the weak coupling one. Finally, we observe that our interacting model turns an isolated symmetric two-level system into an environment-assisted asymmetric one.

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