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Photoinduced biological processes occur via one photon absorption in naturallight, which is weak, CW and incoherent, but are often studied in thelaboratory using pulsed coherent light. Here we compare the response of amolecule to these two very different sources within a quantized radiation fieldpicture. The latter is shown to induce coherent time evolution in the molecule,whereas the former does not. As a result, the coherent time dependence observedin the laboratory experiments will not be relevant to the natural biologicalprocess. Emphasis is placed on resolving confusions regarding this issue thatare shown to arise from aspects of quantum measurement and from a lack ofappreciation of the proper description of the absorbed photon.

Molecular Response in One-Photon Absorption via Natural Thermal Light vs Pulsed Laser Excitation