Coherent Beam Splitting of Flying Electrons Driven by a Surface Acoustic Wave

Ito, R. and Takada, S. and Ludwig, Ar. and Wieck, A.D. and Tarucha, S. and Yamamoto, M.

Volume: 126 Pages:
DOI: 10.1103/PhysRevLett.126.070501
Published: 2021

We develop a coherent beam splitter for single electrons driven through two tunnel-coupled quantum wires by surface acoustic waves (SAWs). The output current through each wire oscillates with gate voltages to tune the tunnel coupling and potential difference between the wires. This oscillation is assigned to coherent electron tunneling motion that can be used to encode a flying qubit and is well reproduced by numerical calculations of time evolution of the SAW-driven single electrons. The oscillation visibility is currently limited to about 3%, but robust against decoherence, indicating that the SAW electron can serve as a novel platform for a solid-state flying qubit. © 2021 American Physical Society.

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