Saki Tanaka, Naoki Yamamoto
It is known that the weak measurement can significantly amplify the mean of measurement results, sometimes out of the range limited in usual quantum measurement. This fact, as actively demonstrated recently in both theory and experiment, implies the possibility to estimate a very small parameter using the weak measurement technique. But does the weak measurement really bring about the increase of "information" for parameter estimation? This paper provides an answer to this question, in a general situation.
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http://arxiv.org/abs/1306.2409
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