| Title: |
Enhanced Electron Spin Coherence in a GaAs Quantum Emitter |
| Authors: |
Nguyen, Giang N., Spinnler, Clemens, Hogg, Mark R., Zhai, Liang, Javadi, Alisa, Schrader, Carolin A., Erbe, Marcel, Wyss, Marcus, Ritzmann, Julian, Babin, Hans-Georg, Wieck, Andreas D., Ludwig, Arne, Warburton, Richard J. |
| Publication Year: |
2023 |
| Collection: |
Condensed Matter
Quantum Physics |
| Subject Terms: |
Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: |
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. |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.131.210805 |
| Access URL: |
http://arxiv.org/abs/2307.02323 |
| Accession Number: |
edsarx.2307.02323 |
| Database: |
arXiv |
