When do weak-coupling approaches accurately capture the dynamics of complex quantum systems?

Abstract

Understanding the dynamics of higher-dimensional quantum systems embedded in a complex environment remains a significant theoretical challenge. While several approaches yielding numerically converged solutions exist, these are computationally expensive and often provide only limited physical insight. Here we address the question when more intuitive and simpler to compute weak-coupling approaches still provide adequate accuracy. We develop a simple analytical criterion and verify its validity for the case of the much-studied FMO dynamics as well as the canonical spin-boson model.

arXiv comment10 pages, 5 figures, comments are very welcome!

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• Optimized auxiliary oscillators for the simulation of general open quantum systems
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• Weak and ultrastrong coupling limits of the quantum mean force Gibbs state
• Tomographically reconstructed master equations for any open quantum dynamics
• Optimizing co-operative multi-environment dynamics in a dark-state-enhanced photosynthetic heat engine
• Canonically consistent quantum master equation
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• Coherent quantum dynamics launched by incoherent relaxation in a quantum circuit simulator of a light-harvesting complex
• Modeling the unphysical pseudomode model with physical ensembles: simulation, mitigation, and restructuring of non-Markovian quantum noise
• Plasmonic bio-sensing for the Fenna-Matthews-Olson complex
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