Enhanced Electron Spin Coherence in a GaAs Quantum Emitter
- URL: http://arxiv.org/abs/2307.02323v1
- Date: Wed, 5 Jul 2023 14:25:36 GMT
- Title: Enhanced Electron Spin Coherence in a GaAs Quantum Emitter
- Authors: Giang N. Nguyen, Clemens Spinnler, Mark R. Hogg, Liang Zhai, Alisa
Javadi, Carolin A. Schrader, Marcel Erbe, Marcus Wyss, Julian Ritzmann,
Hans-Georg Babin, Andreas D. Wieck, Arne Ludwig, and Richard J. Warburton
- Abstract summary: A spin-photon interface should operate with both coherent photons and a coherent spin to enable cluster-state generation and entanglement distribution.
In high-quality devices, self-assembled GaAs quantum dots are near-perfect emitters of on-demand coherent photons.
We implement an all-optical nuclear-spin cooling scheme on a GaAs quantum dot. The electron-spin coherence time increases 156-fold from $T*$ = 3.9 ns to 0.608 $mu$s.
- Score: 0.4065594766856674
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: A spin-photon interface should operate with both coherent photons and a
coherent spin to enable cluster-state generation and entanglement distribution.
In high-quality devices, self-assembled GaAs quantum dots are near-perfect
emitters of on-demand coherent photons. However, the spin rapidly decoheres via
the magnetic noise arising from the host nuclei. Here, we address this drawback
by implementing an all-optical nuclear-spin cooling scheme on a GaAs quantum
dot. The electron-spin coherence time increases 156-fold from $T_2^*$ = 3.9 ns
to 0.608 $\mu$s. The cooling scheme depends on a non-collinear term in the
hyperfine interaction. The results show that such a term is present even though
the strain is low and no external stress is applied. Our work highlights the
potential of optically-active GaAs quantum dots as fast, highly coherent
spin-photon interfaces.
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