{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f10939bdbab0c9cfbb9795a30621a3fd33edbd16b15eca92f8b7408de7e642b7","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","766f3da044f4728a0ee72582ea95a38c2787d7f8ada76555130e16cd54df1772"],"salt":"b305f29dd215e3fa69d8e5c70d260191deecbec74683b48893d875309c79d0df","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"bio.quantum-biology.sunlight-coherence","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"766f3da044f4728a0ee72582ea95a38c2787d7f8ada76555130e16cd54df1772","relation":"special_case"}],"plain":"Laser pulses in the lab start all molecules oscillating together, but sunlight arrives as a steady random stream of photons. The question is whether any quantum coherence relevant to energy transfer exists inside a leaf in real light.","posed_since":"","precise":"Under stationary, broadband thermal excitation (sunlight, roughly one photon absorbed per chlorophyll per 0.1 s, approximately) the steady-state excited density matrix of a light-harvesting complex is diagonal or nearly diagonal in the energy eigenbasis, so pulse-induced quantum beats are absent. Determine whether steady-state coherences (site-basis coherences, noise-induced Fano-type coherences) or transient coherences after individual photon absorptions change the transfer yield or rate by an amount above parameter uncertainty. An answer is a computed yield difference for a realistic complex under thermal illumination.","problem_ref":null,"references":"","settled_by":"An open-quantum-system calculation of a realistic antenna driven by thermal light and coupled to its protein bath, compared with the same model with coherences removed, ideally checked by single-photon or incoherent-light spectroscopy.","status_note":"","title":"Do coherences exist at all under natural incoherent 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