Journal
APPLIED PHYSICS LETTERS
Volume 118, Issue 17, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0045413
Keywords
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Categories
Funding
- EPSRC [EP/L015110/1, EP/M013472/1, EP/P029892/1, EP/N002962/1, EP/T001011/1]
- ERC [725920]
- EU Horizon 2020 research and innovation program [820423]
- Royal Society
- Royal Academy of Engineering
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA0301]
- KIST institutional program
- program of quantum sensor core technology through IITP
- IITP - Korean Government (MSIT) [20190004340011001]
- EPSRC [EP/P029892/1, EP/T001011/1, EP/M013472/1, EP/N002962/1] Funding Source: UKRI
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This study successfully demonstrates the quantum frequency conversion of near-infrared photons from semiconductor quantum dots to the telecommunication C-band, achieving high conversion efficiency and count rates suitable for fiber networks.
On-demand indistinguishable single-photon sources are essential for quantum networking and communication. Semiconductor quantum dots are among the most promising candidates, but their typical emission wavelength renders them unsuitable for use in fiber networks. Here, we present quantum frequency conversion of near-infrared photons from a bright quantum dot to the telecommunication C-band, allowing integration with existing fiber architectures. We use a custom-built, tunable 2400nm seed laser to convert single photons from 942nm to 1550nm in a difference-frequency generation process. We achieve an end-to-end conversion efficiency of similar or equal to 35%, demonstrate count rates approaching 1MHz at 1550nm with g(2)(0) = 0.043(1), and achieve Hong-Ou-Mandel (HOM) visibilities of 60%. We expect this scheme to be preferable to quantum dot sources directly emitting at telecom wavelengths for fiber-based quantum networking. (C) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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