Single-photon emission from single-electron transport in a SAW-driven lateral light-emitting diode

Tzu-Kan Hsiao (), Antonio Rubino, Yousun Chung, Seok-Kyun Son, Hangtian Hou, Jorge Pedrós, Ateeq Nasir, Gabriel Éthier-Majcher, Megan J. Stanley, Richard T. Phillips, Thomas A. Mitchell, Jonathan P. Griffiths, Ian Farrer, David A. Ritchie and Christopher J. B. Ford ()
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Tzu-Kan Hsiao: University of Cambridge
Antonio Rubino: University of Cambridge
Yousun Chung: University of Cambridge
Seok-Kyun Son: University of Cambridge
Hangtian Hou: University of Cambridge
Jorge Pedrós: University of Cambridge
Ateeq Nasir: University of Cambridge
Gabriel Éthier-Majcher: University of Cambridge
Megan J. Stanley: University of Cambridge
Richard T. Phillips: University of Cambridge
Thomas A. Mitchell: University of Cambridge
Jonathan P. Griffiths: University of Cambridge
Ian Farrer: University of Cambridge
David A. Ritchie: University of Cambridge
Christopher J. B. Ford: University of Cambridge

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The long-distance quantum transfer between electron-spin qubits in semiconductors is important for realising large-scale quantum computing circuits. Electron-spin to photon-polarisation conversion is a promising technology for achieving free-space or fibre-coupled quantum transfer. In this work, using only regular lithography techniques on a conventional 15 nm GaAs quantum well, we demonstrate acoustically-driven generation of single photons from single electrons, without the need for a self-assembled quantum dot. In this device, a single electron is carried in a potential minimum of a surface acoustic wave (SAW) and is transported to a region of holes to form an exciton. The exciton then decays and creates a single optical photon within 100 ps. This SAW-driven electroluminescence, without optimisation, yields photon antibunching with g(2)(0) = 0.39 ± 0.05 in the single-electron limit (g(2)(0) = 0.63 ± 0.03 in the raw histogram). Our work marks the first step towards electron-to-photon (spin-to-polarisation) qubit conversion for scaleable quantum computing architectures.

Date: 2020
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DOI: 10.1038/s41467-020-14560-1

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