Interaction-Free Measurement with Electrons

Here, we experimentally demonstrate interaction-free measurements with electrons using a novel electron Mach-Zehnder interferometer. The flexible two-grating electron interferometer is constructed in a conventional transmission electron microscope and achieves high contrast in discrete output detect...

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Bibliographic Details
Published in:Physical review letters 2021-09, Vol.127 (11), p.1-110401, Article 110401
Main Authors: Turner, Amy E., Johnson, Cameron W., Kruit, Pieter, McMorran, Benjamin J.
Format: Article
Language:English
Subjects:
Beam splitters
Electron imaging
Free electrons
Mach-Zehnder interferometers
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Summary:Here, we experimentally demonstrate interaction-free measurements with electrons using a novel electron Mach-Zehnder interferometer. The flexible two-grating electron interferometer is constructed in a conventional transmission electron microscope and achieves high contrast in discrete output detectors, tunable alignment with independently movable beam splitters, and scanning capabilities for imaging. With this path-separated electron interferometer, which closely matches theoretical expectations, we demonstrate electron interaction-free measurements with an efficiency of 14 ± 1%. Implementing this quantum protocol in electron imaging opens a path toward interaction-free electron microscopy.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.110401