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Concept

quantum eraser

A glowing square with radiating lines and particles, symbolizing the concept of a quantum eraser experiment.

A class of experiments, first proposed by Marlan Scully and Kai Drühl in 1982 and realised many times since, in which which-path information about a quantum particle is first recorded and then deliberately destroyed. When the marking is erased, interference fringes reappear in the correlated detection statistics — even when the erasure happens after the particle is already detected, suggesting the relevant quantity is the availability of information, not any physical disturbance.

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