Sound-driven single-electron transfer in a circuit of coupled quantum rails

Takada, S. and Edlbauer, H. and Lepage, H.V. and Wang, J. and Mortemousque, P.-A. and Georgiou, G. and Barnes, C.H.W. and Ford, C.J.B. and Yuan, M. and Santos, P.V. and Waintal, X. and Ludwig, Ar. and Wieck, A.D. and Urdampilleta, M. and Meunier, T. and Bäuerle, C.

Volume: 10 Pages:
DOI: 10.1038/s41467-019-12514-w
Published: 2019

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. © 2019, The Author(s).

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