Posted: Jun 04, 2011 7:30 am
The critical component in their experiment seems to be the concept of a weak measurement.
Hrvoje Nikolic, in this link clarifies:
(Ballentine is the author of a well known book on QM)
Edit And if you're bored this weekend here is a paper with more detail on weak measurements.
Hrvoje Nikolic, in this link clarifies:
To conclude, in a Ballentine style: A strong measurement reveals a property of an individual system, but a weak measurement only reveals a property of a large STATISTICAL ENSEMBLE of equally prepared systems. A weak measurement says nothing about properties of an individual system. All weirdness of weak values results from attempts to interpret properties of an ensemble (2.6 children) as properties of an individual system (a family).
(Ballentine is the author of a well known book on QM)
Edit And if you're bored this weekend here is a paper with more detail on weak measurements.