Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: HL Poster II
HL 35.47: Poster
Mittwoch, 3. April 2019, 17:30–20:00, Poster E
A single quantum emitter in a Mach Zehnder interferometer — •Hendrik Mannel1, Pia Lochner1, Jens Kerski1, Arne Ludwig2, Andreas D. Wieck2, Martin Geller1, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany
A Mach-Zehnder interferometer can be used to measure the coherence of a photon stream by a two-path experiment. In the ultimate limit of a single photon in the interferometer, it is also a realization for the so-called *which-path experiment*. A measurement of the photon path will destroy the interference in the same way, as blocking one arm of the interferometer.
*In this contribution, we place a single self-assembled quantum dot in one arm of the interferometer to answer the question if a single quantum emitter in the Heitler regime [1] acts as an optical block and, thus, destroys the interference pattern. A stabilized Mach*Zehnder interferometer has been built and a single quantum dot was placed in one arm of the interferometer. An applied gate voltage shifts the QD transition in resonance due to the quantum confined Stark effect. We analyzed the interference pattern with and without the quantum dot to answer the question if a resonantly excited quantum dot in one arm destroys or conserves interference.
*[1] C. Matthiesen et al., Phys. Rev. Lett. 108, 093602 (2012)