Study Develops Framework for Quantifying Quantum Coherence's Role in Energy Transfer
Researchers have derived a mathematical framework using Nakajima-Zwanzig projection operators to quantify how quantum coherence influences excitation energy transfer in open quantum systems. The work addresses a longstanding gap: while coherence was known to play a role in such processes, no rigorous quantitative method existed to measure its impact. The findings could advance understanding of energy transfer in biological and artificial light-harvesting systems.
A new theoretical study posted to arXiv introduces a general memory kernel identity, derived via Nakajima-Zwanzig projection operators, that allows researchers to characterize and quantify the contribution of quantum coherence—specifically in the eigenenergy basis—to excitation energy transfer rates in open quantum systems. The authors apply their framework to a model system: an electronic dimer coupled to a structured phonon bath, a setup commonly used to study light-harvesting dynamics. Their results demonstrate that quantum coherence acts to modulate the rate of energy transfer rather than simply enhancing or suppressing it uniformly. The work fills a methodological gap in the field, where qualitative arguments about coherence's role have outpaced quantitative tools. The paper spans 15 pages and includes 10 figures illustrating the theoretical derivations and numerical results. It was submitted on June 11, 2026, and is currently a preprint pending peer review.
What's missing
As a preprint, this work has not yet undergone peer review, so its theoretical claims and numerical results remain unvalidated by independent referees. The study focuses on a dimer model system, and it is unclear how well the framework generalizes to larger, more complex molecular aggregates relevant to real biological light-harvesting complexes. The paper does not appear to include experimental validation of its predictions.
What different sources said
- arXiv physicsCenter
Characterizing the functional role of quantum coherence in energy transfer
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