Room-Temperature, Highly Pure Single-Photon Sources from All-Inorganic Lead Halide Perovskite Quantum Dots
Abstract
Attaining pure single-photon emission is key for many quantum technologies, from optical quantum computing to quantum key distribution and quantum imaging. The past 20 years have seen the development of several solid-state quantum emitters, but most of them require highly sophisticated techniques (e.g., ultrahigh vacuum growth methods and cryostats for low-temperature operation). The system complexity may be significantly reduced by employing quantum emitters capable of working at room temperature. Here, we present a systematic study across ∼170 photostable single CsPbX3 (X: Br and I) colloidal quantum dots (QDs) of different sizes and compositions, unveiling that increasing quantum confinement is an effective strategy for maximizing single-photon purity due to the suppressed biexciton quantum yield. Leveraging the latter, we achieve 98% single-photon purity (g(2)(0) as low as 2%) from a cavity-free, nonresonantly excited single 6.6 nm CsPbI3 QDs, showcasing the great potential of CsPbX3 QDs as room-temperature highly pure single-photon sources for quantum technologies. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000544023Publication status
publishedExternal links
Journal / series
Nano LettersVolume
Pages / Article No.
Publisher
American Chemical SocietySubject
single quantum dot spectroscopy; perovskite quantum dots; single-photon purity; photostable photoluminescence; quantum lightOrganisational unit
03934 - Kovalenko, Maksym / Kovalenko, Maksym
03934 - Kovalenko, Maksym / Kovalenko, Maksym
Funding
192308 - Q-Light - Engineered Quantum Light Sources with Nanocrystal Assemblies (SNF)
188404 - Novel inorganic light emitters: synthesis, spectroscopy and applications (SNF)
899141 - Polariton logic (EC)
Related publications and datasets
Is supplemented by: http://hdl.handle.net/20.500.11850/541481
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