"Photons from two different sources have different characteristics, like color and wavelength. If they have different wavelengths, they cannot interfere, Yu said"
Can somebody explain why that is the case?
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I don't think it's 100% true as stated. https://en.m.wikipedia.org/wiki/Photomixing
That seems like a simple superposition, while I'm going to assume the author meant some sort of quantum interference.
I thought superposition in like was a QM effect.
I can explain that color and wavelength are the same thing, which makes me suspicious of the rest of it.