When do perturbative approaches accurately capture the dynamics of complex quantum systems?

Amir Fruchtman, Neill Lambert, Erik Gauger

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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 do more intuitive and simpler-to-compute second-order perturbative approaches 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.
Original languageEnglish
Article number28204
JournalScientific Reports
Publication statusPublished - 23 Jun 2016

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