Looking for introduction on QND: quantum non-demolition measurements

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I just read a news on physicsweb:

http://physicsweb.org/articles/news/11/3/9"

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
 
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