Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.96: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Towards an interaction-free measurement with electrons — •Sebastian Thomas1, Jakob Hammer1, Johannes Hoffrogge1, and Peter Hommelhoff1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Gemany — 2Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
Exploiting wave-particle duality, it is possible to determine the position of an object without affecting it in any way. This phenomenon is called an “interaction-free measurement” [1]. It can be realized with a single-photon source coupled into a Mach-Zehnder interferometer, where the presence of an object in one of the paths becomes noticeable as it prevents interference at the interferometer exit.
Recently, an interaction-free measurement setup has been proposed with electrons instead of photons [2]. This way, a new type of electron microscope might be constructed, in which samples receive a greatly reduced radiation dose. We discuss general features of interaction-free measurements as well as different approaches towards the realization of such a measurement with electrons. In particular, we investigate the effect of semi-transparent samples, and we consider the application of a linear microwave guide of low-energy electrons [3] for interaction-free measurements.
[1] P. Kwiat, H. Weinfurter, T. Herzog, A. Zeilinger, M. Kasevich, Phys. Rev. Lett. 74, 4763 (1995)
[2] W. Putnam, M. Yanik, Phys. Rev. A 80, 040902 (2009)
[3] J. Hoffrogge, R. Fröhlich, M. Kasevich, P. Hommelhoff, Phys. Rev. Lett. 106, 193001