Linear quantum measurements

Details Linear quantum measurements Linear quantum measurements

2003-01-27

arxiv.org/abs/cond-mat/0301524v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 1 figure

Scientific paper

Linear response theory describes quantum measurement with an arbitrary detector weakly coupled to a measured system. This description produces generic quantitative relation characterizing the detector that is analogous to the fluctuation-dissipation theorem for equilibrium systems. The detector characteristic obtained in this way shows how efficient the trade-off is between the back-action dephasing and information acquisition by the detector.

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