Separation of relaxation timescales via strong system-bath coupling: Dissipative three-level system as a case study

• URL: http://arxiv.org/abs/2507.11712v1
• Date: Tue, 15 Jul 2025 20:31:44 GMT
• Title: Separation of relaxation timescales via strong system-bath coupling: Dissipative three-level system as a case study
• Authors: Brett Min, Matthew Gerry, Dvira Segal,
• Abstract summary: We analytically demonstrate that strong system-bath coupling separates the relaxation dynamics of a dissipative quantum system into two distinct regimes.<n>From a practical perspective, our results suggest that strong coupling to a dissipative bath can autonomously generate and sustain long-lived quantum coherences.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We analytically demonstrate that strong system-bath coupling separates the relaxation dynamics of a dissipative quantum system into two distinct regimes: a short-time dynamics that, as expected, accelerates with increasing coupling to the environment, and a slow dynamics that, counterintuitively, becomes increasingly prolonged at sufficiently strong coupling. Using the reaction-coordinate polaron-transform mapping, we uncover the general mechanism behind this effect and derive accurate expressions for both relaxation timescales. Numerical simulations confirm our analytical predictions. From a practical perspective, our results suggest that strong coupling to a dissipative bath can autonomously generate and sustain long-lived quantum coherences, offering a promising strategy for bath-engineered quantum state preparation.

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