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

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...

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Published in:Nature communications 2019-07, Vol.10 (1), p.2991-6, Article 2991
Main Authors: Fujita, Takafumi, Morimoto, Kazuhiro, Kiyama, Haruki, Allison, Giles, Larsson, Marcus, Ludwig, Arne, Valentin, Sascha R., Wieck, Andreas D., Oiwa, Akira, Tarucha, Seigo
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142/126
147/135
639/624
639/766
639/925
639/925/927/1007
Angular momentum
Circular polarization
Dependence
Electron spin
Electrons
Excitons
Humanities and Social Sciences
Momentum transfer
multidisciplinary
Photons
Polarization
Polarization (spin alignment)
Quantum dots
Quantum theory
Science
Science (multidisciplinary)
Single electrons
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creator Fujita, Takafumi
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description 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. Gate-defined quantum dots offer a way to engineer electrically controllable quantum systems with potential for information processing. Here, the authors transfer angular momentum from the polarization of a single photon to the spin of a single electron in a gate-defined double quantum dot.
doi_str_mv 10.1038/s41467-019-10939-x
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subjects 142/126
147/135
639/624
639/766
639/925
639/925/927/1007
Angular momentum
Circular polarization
Dependence
Electron spin
Electrons
Excitons
Humanities and Social Sciences
Momentum transfer
multidisciplinary
Photons
Polarization
Polarization (spin alignment)
Quantum dots
Quantum theory
Science
Science (multidisciplinary)
Single electrons
title Angular momentum transfer from photon polarization to an electron spin in a gate-defined quantum dot
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