Information amplification via postselection: A parameter-estimation perspective

Saki Tanaka, Naoki Yamamoto

研究成果: Article査読

50 被引用数 (Scopus)

抄録

It is known that 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 clarifies that, in a general situation, the answer is NO; more precisely, the weak measurement cannot further decrease the lower bound of the estimation error, i.e., the so-called Cramér-Rao bound, which is proportional to the inverse of the quantum Fisher information.

本文言語English
論文番号042116
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
88
4
DOI
出版ステータスPublished - 2013 10 21

ASJC Scopus subject areas

  • 原子分子物理学および光学

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