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A delayed-choice quantum eraser experiment, first performed by Yoon-Ho Kim, R. Yu, S. P. Kulik, Y. H. Shih and Marlan O. Scully, [1] and reported in early 1998, is an elaboration on the quantum eraser experiment that incorporates concepts considered in John Archibald Wheeler's delayed-choice experiment.
The quantum eraser experiment was proposed in 1982 in Marlan Scully and Kai Drühl in the paper Quantum eraser: A proposed photon correlation experiment concerning observation and "delayed choice" in quantum mechanics, as a realizable way to test the hitherto untested predictions of quantum mechanics.
Wheeler's delayed-choice experiment describes a family of thought experiments in quantum physics proposed by John Archibald Wheeler, with the most prominent among them appearing in 1978 and 1984. [1] These experiments illustrate the central point of quantum theory:
Delayed-choice quantum eraser: Marlan Scully: Demonstration Delayed-choice (quantum mechanics) 2004 Gravity Probe B: NASA/Stanford University: Confirmation Frame-dragging: 2012 Search for the Higgs boson: CERN: Confirmation Higgs boson: 2015 First observation of gravitational waves: LIGO: Confirmation Gravitational waves
A diagram of Wheeler's delayed choice experiment, showing the principle of determining the path of the photon after it passes through the slit. Wheeler's delayed-choice experiments demonstrate that extracting "which path" information after a particle passes through the slits can seem to retroactively alter its previous behavior at the slits.
Retrocausality is sometimes associated with nonlocal correlations that generically arise from quantum entanglement, including for example the delayed choice quantum eraser. [29] [30] However accounts of quantum entanglement can be given which do not involve retrocausality. They treat the experiments demonstrating these correlations as being ...
The first experiment to change the settings randomly, with the choices made by a quantum random number generator, was Weihs et al.'s 1998 experiment. [18] Scheidl et al. improved on this further in 2010 by conducting an experiment between locations separated by a distance of 144 km (89 mi).
The delayed-choice quantum eraser is a version of the EPR paradox in which the observation (or not) of interference after the passage of a photon through a double slit experiment depends on the conditions of observation of a second photon entangled with the first.