Now, we do have equipment'sequipment to generate single photon Atat a time, and LASERs are nearly monochromatic.
While typing the question, am realisingrealizing that successive photons in case of single photon generation may have slightly different wavelengths, but are its single photonphotons essentially monochromatic? B' cozBecause we may be able to use the phenomena to make highly coherent lasers.