Photosynthetic light harvesting in vivo displays near unit quantum efficiency under ultra-weak illumination conditions. A new generation of experimental and theoretical studies using quantum light sources and coincidence counting now allows explicit study of the absorption of individual photons. First generation experiments reveal a cycle of single photon absorption and single photon fluorescent emission that validates the microscopic interpretation of conventional bulk measurements of quantum efficiency. I shall discuss how these techniques and related theoretical studies can probe the spatiotemporal dynamics of photosynthesis in a new and fundamental manner.
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K. Birgitta Whaley (2024) studied this question.
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