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Occupation Numbers Of Phonons/Photons

  1. Jul 28, 2013 #1
    According to Mahan, phonons or photons doesn't have occupation number. Is this true?http://i.tinyuploads.com/MBwW0j.jpg
  2. jcsd
  3. Jul 28, 2013 #2


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    there are states with definite photons number (Fock states)
    and there are states (e.g coherent states) which are not eigenvectors of the " occupation number" hermitian operator.
  4. Jul 28, 2013 #3
    The text is not saying that. It says that the particular states mentioned (excitations) are
    superpositions of states with a different but definite number of photons.
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