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Gintaras
Gintaras asked in Science & MathematicsPhysics · 5 years ago

QM. Souble slit experiment. How we can observe single photon?

I was reading YouTube comments and I found very good question. How it's posible for detector to detect photon if photon is smallest quantum of energy? So detector should obsorbe photon to interact with it.

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  • Andrew Smith
    Lv 7
    5 years ago

    The photon "knocks out" an electron.

    Now in things like a MASER this one electron triggered an avalanche of other electrons.

    But due to random noise it needed to be supercooled.

    The detector detects a single photon but the results are not discernible from background noise unless many photons are involved.

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