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Photon vs other fundamental particles - decoherence

  1. Dec 25, 2013 #1
    1. What (property) makes a photon less likely to decohere/(entangle with the environment) relative to other "fundamental" particles (non leptons?) such as an electron?...say during single particle interference experiment

    Photon single particle interference can done without the need for a vacuum.

    2 Which other "fundamental" particles can show interference (easily) without having to create a vacuum?
    Last edited: Dec 25, 2013
  2. jcsd
  3. Dec 25, 2013 #2


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    Photons are interacting only electromagnetically, which is a pretty weak interaction, and the surrounding matter in our labs is (nearly) electrically neutral. So it's pretty easy to keep a photon nearly free, i.e., not undergoing interactions with surrounding matter.
  4. Dec 25, 2013 #3
    Thanks vanhees.

    So besides electromagnetic what other (not so weak) interaction does an electron have? (That a photon doesn't)

    When we keep a photon nearly free - is the photon assumed entangled with itself?
    Last edited: Dec 25, 2013
  5. Dec 25, 2013 #4


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    The photon is neutral, while the electron is charged - thus even the electromagnetic interactions of the electron are stronger.

    As a practical matter, photon sources are also easier to set up and manage than electron sources.
  6. Dec 26, 2013 #5
    and/or more prone to deco/enta

    spin orientation.

    Last edited: Dec 26, 2013
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