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Re: Quantum question?

I suggest a Michelson interferometer or modern variant. Even with light
entering at a low enough rate, there is a finite range of difference in optical
path lengths in which one observes interference. One can know the energy of the
atom photon system and not necessarily know the energy of the photon. The
world is not made of things in energy eigenstates

Thanks
Roger Haar U of AZ
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Jack Uretsky wrote:

Please tell me how to measure the width of a single photon, or,
for that matter, its extent in space and time. What photonic process do
you invoke? What instruments do you use?