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The Meaning of the Interaction-Free Measurements
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Interaction-free measurements introduced by Elitzur and Vaidman [Found. Phys. 23, 987 (1993)] allow finding infinitely fragile objects without destroying them. Many experiments have been successfully performed showing that indeed, the original scheme and its modifications lead to reduction of the disturbance of the observed systems. However, there is a controversy about the validity of the term ``interaction-free'' for these experiments. Broad variety of such experiments are reviewed and the meaning of the interaction-free measurements is clarified.
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Counterfactual Quantum Sensing: What Interaction-Free Measurement Can and Cannot Buy
Interaction-free interferometry carries half the Fisher information of direct probing for transmissivity, equal information per absorbed photon, and only beats direct schemes when distinguishing an object from empty s...
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