Delayed “Choice” Quantum Eraser

Abstract
We report a delayed “choice” quantum eraser experiment of the type proposed by Scully and Drühl (where the “choice” is made randomly by a photon at a beam splitter). The experimental results demonstrate the possibility of delayed determination of particlelike or wavelike behavior via quantum entanglement. The which-path or both-path information of a quantum can be marked or erased by its entangled twin even after the registration of the quantum.
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