Interaction-Free Measurement with Electrons

Amy E. Turner*, Cameron W. Johnson, Pieter Kruit, Benjamin J. McMorran

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
142 Downloads (Pure)


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.

Original languageEnglish
Article number110401
Pages (from-to)6
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 2021


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