Abstract
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 2400 nm seed laser to convert single photons from 942 nm to 1550 nm in a difference-frequency generation process. We achieve an end-to-end conversion efficiency of ≃35%, demonstrate count rates approaching 1 MHz at 1550 nm 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.
Highlights
One route to bridge the gap to the C-band is quantum frequency conversion (QFC), converting single photons from an NIR quantum dots (QDs) to telecommunication wavelengths
We achieve an end-to-end conversion efficiency of ’35%, demonstrate count rates approaching 1 MHz at 1550 nm with gð2Þð0Þ 1⁄4 0:043ð1Þ, 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
One route to bridge the gap to the C-band is quantum frequency conversion (QFC), converting single photons from an NIR QD to telecommunication wavelengths
Summary
ARTICLES YOU MAY BE INTERESTED IN Progress in quantum-dot single photon sources for quantum information technologies: A broad spectrum overview Applied Physics Reviews 7, 021309 (2020); https://doi.org/10.1063/5.0010193 Invited Review Article: Single-photon sources and detectors Review of Scientific Instruments 82, 071101 (2011); https://doi.org/10.1063/1.3610677 Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks Applied Physics Letters 118, 100502 (2021); https://doi.org/10.1063/5.0038729
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