New Experimental Realization of a Quantum Eraser Based on Downconversion
The concept of a quantum eraser, which was introduced by Scully and Drühl1, rests on the relationship between coherence and the indistinguishability of the different photon path(s) in an interference experiment.2–4 Interference effects disappear whenever it is possible, at least in principle, to identify the path of the photons. But if the path information could be erased in some way, the interference should reappear. Several possible forms of quantum eraser have already been described.5,6 We report on a variant of these based on parametric downconversion.
KeywordsBeam Splitter Polarization Rotation Optical Path Difference Path Information Photon Path
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