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

Takafumi Fujita (), Kazuhiro Morimoto, Haruki Kiyama, Giles Allison, Marcus Larsson, Arne Ludwig, Sascha R. Valentin, Andreas D. Wieck, Akira Oiwa and Seigo Tarucha
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Takafumi Fujita: The University of Tokyo
Kazuhiro Morimoto: The University of Tokyo
Haruki Kiyama: The University of Tokyo
Giles Allison: The University of Tokyo
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
Seigo Tarucha: The University of Tokyo

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-10939-x

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