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Updated: Oct 19, 2025

Scanning-probe Single-electron Capacitance Spectroscopy
Published on: July 30, 2013
Interaction-Free Measurement with Electrons
Amy E Turner1, Cameron W Johnson1, Pieter Kruit2
1Department of Physics, University of Oregon, Eugene, Oregon 97403, USA.
Abstract:
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.
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