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Takada, Shintaro; Edlbauer, Hermann; Lepage, Hugo V; Wang, Junliang; Mortemousque, Pierre-André; Georgiou, Giorgos; Barnes, Crispin H W; Ford, Christopher J B; Yuan, Mingyun; Santos, Paulo V; Waintal, Xavier; Ludwig, Arne; Wieck, Andreas D; Urdampilleta, Matias; Meunier, Tristan; Bäuerle, Christopher
Nature communications, 10/2019, Letnik: 10, Številka: 1Journal Article
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. This transfer mechanism makes SAW technologies a promising candidate to convey quantum information through a circuit of quantum logic gates. Here we present two essential building blocks of such a SAW-driven quantum circuit. First, we implement a directional coupler allowing to partition a flying electron arbitrarily into two paths of transportation. Second, we demonstrate a triggered single-electron source enabling synchronisation of the SAW-driven sending process. Exceeding a single-shot transfer efficiency of 99%, we show that a SAW-driven integrated circuit is feasible with single electrons on a large scale. Our results pave the way to perform quantum logic operations with flying electron qubits.
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