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

R. Ito, S. Takada, A. Ludwig, A. D. Wieck, S. Tarucha, and M. Yamamoto
Phys. Rev. Lett. 126, 070501 – Published 16 February 2021
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Abstract

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.

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  • Received 23 April 2020
  • Accepted 7 January 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.070501

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

R. Ito1,*, S. Takada2, A. Ludwig3, A. D. Wieck3, S. Tarucha1, and M. Yamamoto1,†

  • 1Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 2National Institute of Advanced Industrial Science and Technology, National Metrology Institute of Japan, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
  • 3Angewandte Festkörperphysk, Ruhr-Universität Bochum, D-44780 Bochum, Germany

  • *ryo.ito@riken.jp
  • michihisa.yamamoto@riken.jp

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Issue

Vol. 126, Iss. 7 — 19 February 2021

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