Sound-driven single-electron transfer in a tunable beam-splitter setup Shintaro Takada 1,2,† , Hermann Edlbauer 1,† , Hugo V. Lepage 3 , Junliang Wang 1 , Pierre-Andr´ e Mortemousque 1 , Giorgos Georgiou 1,4 , Crispin H. W. Barnes 3 , Chris J. B. Ford 3 , Mingyun Yuan 5 , Paulo V. Santos 5 , Xavier Waintal 6 , Arne Ludwig 7 , Andreas D. Wieck 7 , Matias Urdampilleta 1 , Tristan Meunier 1 & Christopher B¨auerle 1,⋆ 1 Univ. Grenoble Alpes, CNRS, Institut N´ eel, 38000 Grenoble, France 2 National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ) 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan 3 Cavendish Laboratory, Department of Physics, University of Cambridge Cambridge CB3 0HE, United Kingdom 4 Univ. Savoie Mont-Blanc, CNRS, IMEP-LAHC, 73370 Le Bourget du Lac, France 5 Paul-Drude-Institut f¨ ur Festk¨ orperelektronik, Hausvogteiplatz 5-7, 10117 Berlin Germany 6 Univ. Grenoble Alpes, CEA, INAC-Pheliqs, 38000 Grenoble, France 7 Lehrstuhl f¨ ur Angewandte Festk¨ orperphysik, Ruhr-Universit¨at Bochum Universit¨atsstraße 150, 44780 Bochum, Germany † these authors contributed equally to this work ⋆ corresponding author: christopher.bauerle@neel.cnrs.fr Surface acoustic waves (SAWs) strongly modulate the shallow electric potential in piezoelectric materials. In semiconductor heterostructures such as GaAs/AlGaAs, SAWs can thus be employed to transfer individual electrons between distant quantum dots 1–3 . This transfer mechanism makes SAW technologies a promising candidate to convey quantum information through a circuit of quantum logic gates 4,5 . Here we present two essential building blocks of such a SAW-driven quantum circuit. First, we implement a triggered single-electron source enabling synchronisation of SAW-driven transport along parallel paths. Then, we couple a pair of transport channels via a tunnel barrier to partition a flying electron arbitrarily into the two paths. All of the presented single-shot experiments are performed with a transfer efficiency exceeding 99 %. Our results open up the way to perform quantum logic operations on the fly and show that a SAW-driven integrated circuit is feasible with single electrons on a large scale. 1 arXiv:1903.00684v1 [cond-mat.mes-hall] 2 Mar 2019