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quantum bomb detector used to detect rubidium  Researchers bring
the funnest thought experiment to life by building a quantum …
One of the less-than-pleasant facts of life in quantum mechanics
is that the act of measuring will change the item that has been
measured. The reality is that we don't often run up against this
limit. To use a poor analogy, current measurements are rather
like dropping dynamite in a fish pond and then proudly reporting
that the total number of live fish in the pond was 25, but,
thanks to our very accurate measurement, we can state that the
total number of live fish is now zero.   Less accurate, but less
disruptive measurements would be better. But the ultimate is the
measurement that delivers the maximum amount of information for
the minimum amount of dead fish. (Okay, this analogy has gone on
too long and, frankly, is starting to stink.)  A group of
researchers from France are reporting that they have developed a
system