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Angular momentum transfer from photon polarization to an electron spin in a gate-defined quantum dot

Author

Listed:
  • Takafumi Fujita

    (The University of Tokyo
    Osaka University)

  • Kazuhiro Morimoto

    (The University of Tokyo)

  • Haruki Kiyama

    (The University of Tokyo
    Osaka University)

  • Giles Allison

    (The University of Tokyo
    RIKEN)

  • Marcus Larsson

    (The University of Tokyo)

  • Arne Ludwig

    (Ruhr-Universität Bochum)

  • Sascha R. Valentin

    (Ruhr-Universität Bochum)

  • Andreas D. Wieck

    (Ruhr-Universität Bochum)

  • Akira Oiwa

    (Osaka University
    Osaka University
    Osaka University)

  • Seigo Tarucha

    (The University of Tokyo
    RIKEN)

Abstract

Gate-defined quantum dots (QDs) are such a highly-tunable quantum system in which single spins can be electrically coupled, manipulated, and measured. However, the spins in gate-defined QDs are lacking its interface to free-space photons. Here, we verify that a circularly-polarized single photon can excite a single electron spin via the transfer of angular momentum, measured using Pauli spin blockade (PSB) in a double QD. We monitor the inter-dot charge tunneling which only occur when the photo-electron spin in one QD is anti-parallel to the electron spin in the other. This allows us to detect single photo-electrons in the spin-up/down basis using PSB. The photon polarization dependence of the excited spin state was finally confirmed for the heavy-hole exciton excitation. The angular momentum transfer observed here is a fundamental step providing a route to instant injection of spins, distributing single spin information, and possibly towards extending quantum communication.

Suggested Citation

  • Takafumi Fujita & Kazuhiro Morimoto & Haruki Kiyama & Giles Allison & Marcus Larsson & Arne Ludwig & Sascha R. Valentin & Andreas D. Wieck & Akira Oiwa & Seigo Tarucha, 2019. "Angular momentum transfer from photon polarization to an electron spin in a gate-defined quantum dot," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10939-x
    DOI: 10.1038/s41467-019-10939-x
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