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arXiv · 1903.00684

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

Shintaro Takada·Hermann Edlbauer·Hugo V. Lepage·Junliang Wang·Pierre-André Mortemousque·Giorgos Georgiou·Crispin H. W. Barnes·Chris J. B. Ford·Mingyun Yuan·Paulo V. Santos·Xavier Waintal·Arne Ludwig·Andreas D. Wieck·Matias Urdampilleta·Tristan Meunier·Christopher Bäuerle
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Abstract

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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Shintaro Takada, Hermann Edlbauer, Hugo V. Lepage, Junliang Wang, Pierre-André Mortemousque, Giorgos Georgiou, Crispin H. W. Barnes, Chris J. B. Ford, Mingyun Yuan, Paulo V. Santos, Xavier Waintal, Arne Ludwig, Andreas D. Wieck, Matias Urdampilleta, Tristan Meunier, Christopher Bäuerle. 2019-03-02. Sound-driven single-electron transfer in a circuit of coupled quantum rails. https://doi.org/10.1038/s41467-019-12514-w

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