Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.88: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Interaction-free measurements with free electrons — •Sebastian Thomas, Jakob Hammer, Dominik Ehberger, and Peter Hommelhoff — Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 1, 91058 Erlangen

In quantum mechanics, it is possible to determine the position of an object without disturbing it in any way. This phenomenon is called an “interaction-free measurement”. It was experimentally verified using single photons [1]. Recently, an interaction-free measurement setup has been proposed with electrons instead of photons [2]. This could make it possible to design a new type of electron microscope, in which samples receive a greatly reduced radiation dose. We consider different approaches towards the realization of an interaction-free measurement. In particular, we discuss possible designs of an electron beam splitter. Additionally, we examine the effect of semitransparent samples in interaction-free measurements. We compare the performance of interaction-free gray-value measurements in the proposed setup to classical transmission measurements and to an ideal quantum measurement scheme [3].

[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] G. Mitchison, S. Massar, S. Pironio, Phys. Rev. A 65, 22110 (2002)