Purcell enhancement of a single silicon carbide color center with coherent spin control

Crook, A. L. et al. (2020) Purcell enhancement of a single silicon carbide color center with coherent spin control. Nano Letters, 20(5), pp. 3427-3434. (doi: 10.1021/acs.nanolett.0c00339) (PMID:32208710)

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Silicon carbide has recently been developed as a platform for optically addressable spin defects. In particular, the neutral divacancy in the 4H polytype displays an optically addressable spin-1 ground state and near-infrared optical emission. Here, we present the Purcell enhancement of a single neutral divacancy coupled to a photonic crystal cavity. We utilize a combination of nanolithographic techniques and a dopant-selective photoelectrochemical etch to produce suspended cavities with quality factors exceeding 5000. Subsequent coupling to a single divacancy leads to a Purcell factor of ∼50, which manifests as increased photoluminescence into the zero-phonon line and a shortened excited-state lifetime. Additionally, we measure coherent control of the divacancy ground-state spin inside the cavity nanostructure and demonstrate extended coherence through dynamical decoupling. This spin-cavity system represents an advance toward scalable long-distance entanglement protocols using silicon carbide that require the interference of indistinguishable photons from spatially separated single qubits.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Bayliss, Dr Sam
Authors: Crook, A. L., Anderson, C. P., Miao, K. C., Bourassa, A., Lee, H., Bayliss, S. L., Bracher, D. O., Zhang, X., Abe, H., Ohshima, T., Hu, E. L., and Awschalom, D. D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nano Letters
Publisher:American Chemical Society
ISSN (Online):1530-6992
Published Online:25 March 2020
Copyright Holders:Copyright © 2020 American Chemical Society
First Published:First published in Nano Letters 20(50:3427-3434
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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