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## Main Question or Discussion Point

Is there any way to accurately measure the wavelength of a single,

individual photon? How precise could such a measurement be?

I will be satisfied if the "measurement" consists only of confirmation

that a photon from a monochromatic source has the expected value,

as long as it has sufficient precision to provide useful information

about the photon. But it would be better if the wavelength could

actually be measured without knowing beforehand exactly what

the wavelength should be.

If the former is possible but the latter is not, I would like to know

anything you can tell me about what makes the difference.

-- Jeff, in Minneapolis

individual photon? How precise could such a measurement be?

I will be satisfied if the "measurement" consists only of confirmation

that a photon from a monochromatic source has the expected value,

as long as it has sufficient precision to provide useful information

about the photon. But it would be better if the wavelength could

actually be measured without knowing beforehand exactly what

the wavelength should be.

If the former is possible but the latter is not, I would like to know

anything you can tell me about what makes the difference.

-- Jeff, in Minneapolis