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In quantum mechanics, a quantum eraser experiment is an interferometer experiment that demonstrates several fundamental aspects of quantum mechanics, including quantum entanglement and complementarity. [1] [2]: 328 The quantum eraser experiment is a variation of Thomas Young's classic double-slit experiment. It establishes that when action is ...
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.
Such eyebrow-raising features of time in quantum mechanics have been.. . described ‘as one of the most intriguing effects in quantum mechanics’.. . The quantum eraser concept has been studied and extended in many different experiments and scenarios, for example, the entanglement quantum eraser, the kaon quantum eraser, and the use of ...
Cosmic versions of the delayed-choice use photons emitted billions of years ago; the results are unchanged. [3] The concept of delayed choice has been productive of many revealing experiments. [4] New versions of the delayed choice concept use quantum effects to control the "choices", leading to quantum delayed-choice experiments.
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One may go further in devising an experiment in which the experimenter gets rid of this "which-path information" by a "quantum eraser". Then, according to the Copenhagen interpretation , the case A applies again and the interference pattern is restored.
The quantum eraser experiments that use entangled photons are the most difficult for me to deal with. The temporal sequences seem impossible to explain away. I think Cramer has the same feeling about those experiments, and he has attempted to make an experiment that would permit something like instantaneous communication between, e.g., Earth ...