科学素养与现象阐释·英语30篇（6）
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2026-D029: Quantum Coherence Timescales in Photosynthetic Light-Harvesting Complexes: Beyond Classical Energy Transfer Models
2026-D029：光合捕光复合体中的量子相干时间尺度：超越经典能量传递模型
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Ultrafast spectroscopy reveals oscillatory quantum beats in Fenna-Matthews-Olson (FMO) complexes, indicating electronic coherence persisting up to 600 femtoseconds at room temperature.
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This contradicts classical Förster resonance energy transfer theory, which assumes incoherent, diffusive hopping between chromophores.
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Coherence arises from delocalized excitons spanning multiple bacteriochlorophyll molecules, stabilized by protein scaffold vibrations.
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Environmental noise does not destroy coherence immediately; instead, structured protein fluctuations enhance quantum efficiency via environment-assisted quantum transport (ENAQT).
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Cryo-EM structures show precise chromophore positioning and orientation, optimized by evolution to sustain constructive interference pathways.
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Computational modeling combining density functional theory and hierarchical equations of motion reproduces observed coherence lifetimes only when nuclear correlations are included.
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Such quantum effects likely confer selective advantage in low-light conditions by accelerating energy funneling toward reaction centers.
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Synthetic biologists now engineer artificial light-harvesting arrays inspired by these principles to improve photovoltaic quantum yield.
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The persistence of coherence at physiological temperatures challenges assumptions about rapid decoherence in warm, wet biological environments.
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This bridges quantum physics and evolutionary biology, suggesting natural selection operates on quantum dynamical properties.
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Ongoing experiments test whether coherence influences charge separation fidelity in reaction center complexes.
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It redefines photosynthesis not as a series of stochastic chemical steps but as a wave-like, quantum-coherent energy navigation process.