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Quantum Studies Mathematics and Foundations

Position measurement-induced collapse states and boundary bound diffraction: an idealised experiment

Moncy V. John, Kiran Mathew

Published Nov 23, 2020• 0 citations
Publisher
DOI
10.1007/s40509-020-00238-2

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We report on an experiment with polarized atoms passing a standing light wave, where the atom's position is encoded (entangled) with the excitation amplitude of two long lived electronic states. Position information can be obtained a posteriori by measuring the electronic state. If this measurement is performed, the atom is localized in an array of virtual slits. This gives rise to diffraction of the atomic de Broglie waves from a measurement induced amplitude grating, thus showing the back action onto the momentum due to the localization. We further demonstrate experimentally that the encoding can be totally erased.