Interaction-free measurements with electrons
| dc.contributor.advisor | McMorran, Benjamin | |
| dc.contributor.author | Turner, Amy | |
| dc.date.accessioned | 2022-10-04T19:29:35Z | |
| dc.date.available | 2022-10-04T19:29:35Z | |
| dc.date.issued | 2022-10-04 | |
| dc.description.abstract | Quantum-enhanced electron imaging promises highly efficient, low-damage transmission electron microscopy, transforming high-resolution imaging of samples affected by beam irradiation. One proposed quantum protocol for damage-free imaging is interaction-free measurement. However, this quantum phenomenon had yet to be experimentally realized with electrons. In this dissertation, we demonstrate the first interaction-free measurement with electrons. To realize this quantum protocol with electrons required the development of a novel, free-electron interferometer constructed in a conventional transmission electron microscope. Here we design and create a flexible two-grating electron Mach-Zehnder interferometer with high contrast in discrete outputs. We test this balanced interferometer with equal-intensity paths to map the electrostatic potential around a nanorod and perform quantitative phase imaging of a nanoparticle. We then achieve a quantum-enhanced, counterfactual measurement with electrons - the interaction-free measurement. Comparing this novel electron interferometer to conventional electron holography, which is a well-established technique in electron microscopy, we find that the interferometer is more suitable for electron interaction-free measurements due to the high contrast in discrete outputs. The two-grating interferometer is then optimized for higher efficiency interaction-free measurements by forming a weak interaction probe that decreases the probability of interacting with the sample. The modified configuration more than doubles the interaction-free measurement efficiency of the original balanced interferometer. This body of work not only includes the development of a versatile electron interferometer, capable of a broad scope of measurements, but realizes a fundamental quantum experiment. Achieving the interaction-free measurement with electrons takes us one step closer to developing a functional quantum-enhanced electron microscope. | en_US |
| dc.identifier.uri | https://hdl.handle.net/1794/27558 | |
| dc.language.iso | en_US | |
| dc.publisher | University of Oregon | |
| dc.rights | All Rights Reserved. | |
| dc.title | Interaction-free measurements with electrons | |
| dc.type | Electronic Thesis or Dissertation | |
| thesis.degree.discipline | Department of Physics | |
| thesis.degree.grantor | University of Oregon | |
| thesis.degree.level | doctoral | |
| thesis.degree.name | Ph.D. |
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