Polaron Transformed Canonically Consistent Quantum Master Equation

• URL: http://arxiv.org/abs/2604.02731v1
• Date: Fri, 03 Apr 2026 04:49:43 GMT
• Title: Polaron Transformed Canonically Consistent Quantum Master Equation
• Abstract summary: We develop a polaron-transformed version of the canonically consistent quantum master equation (CCQME)<n>The CCQME extends beyond standard weak-coupling approaches while retaining the same numerical complexity as conventional quantum master equations.<n>We predict an initial-state-independent slowing down of thermalization in the strong-coupling regime of the spin-boson model.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A central challenge in the theory of open quantum systems is the development of theoretical frameworks capable of accurately describing large, strongly interacting quantum many-body systems in the regime of strong system-bath interaction. In this work, we take a step toward this goal by formulating a polaron-transformed version of the canonically consistent quantum master equation (CCQME) [T. Becker et al., Phys. Rev. Lett. 129, 200403 (2022)]. The CCQME extends beyond standard weak-coupling approaches while retaining the same numerical complexity as conventional quantum master equations, thereby enabling the treatment of large quantum systems. The polaron transformation further enhances the accessible system-bath interaction strengths, allowing us to move from moderate to strong interaction regimes. We present a unified and transparent derivation of these two approaches and combine them to obtain the polaron-transformed CCQME (PT-CCQME). Applying our method to the paradigmatic spin-boson model, we find excellent agreement with numerically exact time-evolving matrix product operator (TEMPO) simulations. Finally, we predict an initial-state-independent slowing down of thermalization in the strong-coupling regime of the spin-boson model.

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