= Interaction-free measurement
{wiki=Interaction-free_measurement}
Interaction-free measurement is a quantum phenomenon that allows the determination of the presence of an object without the direct interaction that would normally occur in a conventional measurement. This concept is most famously illustrated by the "Elitzur-Vaidman bomb tester" thought experiment. In a classical measurement scenario, when a measurement is made on a system, an observer typically interacts with that system, which can alter its state.
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