Nonlinear quantum optics at a topological interface enabled by defect engineering

Abstract

The integration of topology into photonics has generated a new design framework for constructing robust and unidirectional waveguides, which are not feasible with traditional photonic devices. Here, we overcome current barriers to the successful integration of quantum emitters such as quantum dots (QDs) into valley-Hall (VH) topological waveguides, utilising photonic defects at the topological interface to stabilise the local charge environment and inverse design for efficient topological-conventional mode conversion. By incorporating QDs within defects of VH-photonic crystals, we demonstrate the first instances of single-photon resonant fluorescence and resonant transmission spectroscopy of a quantum emitter at a topological waveguide interface. Our results bring together topological photonics with optical nonlinear effects at the single-photon level, offering a new avenue to investigate the interaction between topology and quantum nonlinear systems.

Metadata

Item Type:	Article
Authors/Creators:	Hallacy, L. Martin, N.J. Mehrabad, M.J. Hallett, D. Chen, X. Dost, R. Foster, A. Brunswick, L. Fenzl, A. Clarke, E. https://orcid.org/0000-0002-8287-0282 Patil, P.K. Fox, A.M. https://orcid.org/0000-0002-9025-2441 Skolnick, M.S. https://orcid.org/0000-0002-3972-8344 Wilson, L.R.
Copyright, Publisher and Additional Information:	© The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Keywords:	Optical physics; Optics and photonics; Physics; Quantum physics; Single photons and quantum effects
Dates:	Published: 6 March 2025 Published (online): 6 March 2025 Accepted: 19 January 2025 Submitted: 4 September 2024
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematical and Physical Sciences The University of Sheffield > Faculty of Engineering (Sheffield) > School of Electrical and Electronic Engineering
Funding Information:	Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/N031776/1 Engineering and Physical Sciences Research Council EP/T001011/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/V026496/1
Depositing User:	Symplectic Sheffield
Date Deposited:	10 Mar 2025 14:40
Last Modified:	10 Mar 2025 14:40
Status:	Published
Publisher:	Springer Science and Business Media LLC
Refereed:	Yes
Identification Number:	10.1038/s44310-025-00057-6
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:224269

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Nonlinear quantum optics at a topological interface enabled by defect engineering

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