Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 17: Poster Session I
DS 17.1: Poster
Dienstag, 13. März 2018, 18:15–20:15, Poster B
Coherent manipulation of a single electron surfing on a sound wave — Shintaro Takada1,2, •Hermann Edlbauer1, Arne Ludwig3, Andreas D. Wieck3, Tristan Meunier1, and Christopher Bäuerle1 — 1Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France — 2National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan — 3Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780, Bochum, Germany
Surface acoustic waves (SAW) provide a promising platform to realize quantum optics experiments with electrons at the single particle level. Earlier experiments have shown SAW-assisted single electron transport between spatially separated quantum dots over a distance of 4 mm with an efficiency of about 92 % [1]. Here we go an important step further. We couple two quantum channels by a tunnel barrier along a region of 2 µm and demonstrate transport over a distance of 22 µm with extremely high efficiency above 99 %. Changing energy detuning in the coupling region we can partition the electron on-demand into the two paths. Lowering the barrier height we additionally observe tunnel oscillations of the probability that the electron ends up at the upper or the lower channel. This finding demonstrates coherent manipulation of the electron quantum state on the fly. Our results pave the way for the implementation of a solid state flying qubit having high relevance in fundamental research and quantum information technology.
[1] Hermelin et al., Nature 477, 435 (2011)