{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e39433cfff2d1f39022b96b1db2489a703b466d59fc99a3202167c902a0cf4b3","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"612263773810af248c7bb5bf93068da63f9e5a114a7bddadf261df1912cdcfd3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"bio.quantum-biology.photosynthetic-coherence","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"In photosynthesis, energy from absorbed light hops between pigment molecules to a reaction center where it is stored, and laser experiments show wave-like oscillations during this transfer. It is unclear whether these quantum oscillations make transfer faster or more efficient, or are a side effect of molecular vibrations.","posed_since":"2007","precise":"For the FMO complex, LH2 and photosystem II antennae at $300\\,\\mathrm{K}$, with excitonic Hamiltonians and spectral densities fitted to linear and two-dimensional electronic spectra, compute transfer time and quantum efficiency to the trap with exact exciton-vibration dynamics (for example the hierarchical equations of motion) and with interexciton coherence removed by construction (incoherent Forster or Redfield rates from the same parameters). An answer is the size of the efficiency and rate difference, and whether it exceeds the uncertainty from the Hamiltonian parameters.","problem_ref":null,"references":"","settled_by":"A benchmarked calculation, with parameters fixed by spectroscopy, showing the coherent and incoherent transfer efficiencies and rates differ by more or less than the parameter uncertainty, plus mutant or isotope-substitution experiments that alter coherence without altering energetics.","status_note":"Most long-lived oscillations in 2D spectra are now attributed to vibrational or vibronic coherence, and a 2021 Science Advances analysis concluded coherence probably does not raise efficiency; the functional role of vibronic mixing is still debated.","title":"Does electronic coherence speed or protect photosynthetic energy 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