Purcell-enhanced single photons at telecom wavelengths from a quantum dot in a photonic crystal cavity

Abstract

Quantum dots are promising candidates for telecom single photon sources due to their tunable emission across the different low-loss telecommunications bands, making them compatible with existing fiber networks. Their suitability for integration into photonic structures allows for enhanced brightness through the Purcell effect, supporting efficient quantum communication technologies. Our work focuses on InAs/InP QDs created via droplet epitaxy MOVPE to operate within the telecoms C-band. We observe a short radiative lifetime of 340 ps, arising from a Purcell factor of 5, owing to integration of the QD within a low-mode-volume photonic crystal cavity. Through in-situ control of the sample temperature, we show both temperature tuning of the QD’s emission wavelength and a preserved single photon emission purity at temperatures up to 25K. These findings suggest the viability of QD-based, cryogen-free C-band single photon sources, supporting applicability in quantum communication technologies.

Metadata

Item Type:	Article
Authors/Creators:	Phillips, C.L. https://orcid.org/0000-0001-9899-9876 Brash, A.J. Godsland, M. Martin, N.J. Foster, A. Tomlinson, A. Dost, R. Babazadeh, N. Sala, E.M. Wilson, L. Heffernan, J. Skolnick, M.S. Fox, A.M.
Copyright, Publisher and Additional Information:	© The Author(s) 2024. Open Access: 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:	Quantum optics; Single photons and quantum effects
Dates:	Published: 23 February 2024 Published (online): 23 February 2024 Accepted: 16 February 2024 Submitted: 13 November 2023
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	27 Feb 2024 13:09
Last Modified:	27 Feb 2024 21:09
Status:	Published
Publisher:	Springer Science and Business Media LLC
Refereed:	Yes
Identification Number:	10.1038/s41598-024-55024-6
Related URLs:	PubMed URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:209636

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Purcell-enhanced single photons at telecom wavelengths from a quantum dot in a photonic crystal cavity

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