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Looking for introduction on QND: quantum non-demolition measurements

  1. Mar 20, 2007 #1
    I just read a news on physicsweb:

    Physicists watch the "birth, life and death of a photon"

    This is called a "quantum non-demolition (QND) measurement on single photons".

    I would like to know a little bit more about QNDs.
    Why they are called so.
    What is special about these QND experiments, or maybe paradoxal (I guess nothing).
    Why this single photon experiment is called a QND.
    Why it is possible to -apparently- observe a single photon without destroying it.
    If and how the photon observed in this experiment has been perturbed?
    I guess that non-demolition does not mean non-interaction ...

    Web sites, papers, comments, ideas, ... welcome.

    Michel
     
  2. jcsd
  3. Mar 20, 2007 #2
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