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Purcell-Enhanced Single-Photon Generation from CsPbBr3 Quantum Dots in In Situ Selected Laguerre-Gaussian Modes
Virginia Oddi1,2, Darius Urbonas1, Etsuki Kobiyama1
1IBM Research Europe - Zurich, Säumerstrasse 4, Rüschlikon 8803, Switzerland.
ACS Nano
|February 12, 2026
Summary
Researchers directly generated single photons with orbital angular momentum (OAM) using perovskite quantum dots in a microcavity. This breakthrough accelerates single-photon emission for advanced quantum technologies.
Area of Science:
- Quantum optics and photonics
- Materials science for quantum applications
- Nanophotonics and microcavity devices
Background:
- Single photons with orbital angular momentum (OAM) are crucial for quantum communication, metrology, and imaging.
- Direct generation of OAM single photons is challenging, often requiring indirect methods or additional optical elements.
- Colloidal perovskite quantum dots (QDs) offer high-rate, indistinguishable single-photon emission.
Purpose of the Study:
- To demonstrate direct, on-demand generation of single photons carrying orbital angular momentum (OAM).
- To utilize Purcell enhancement in a microcavity to accelerate single-photon emission rates.
- To enable selective coupling of quantum dots to specific Laguerre-Gaussian (LG) modes.
Main Methods:
- Integration of single CsPbBr3 quantum dots into an open Fabry-Perot microcavity.
- Incorporation of a nanofabricated Gaussian-shaped deformation in the microcavity.
- In situ tuning of microcavity resonance to control coupling between QDs and LG modes.
Main Results:
- Achieved Purcell-enhanced single-photon generation with accelerated decay rates up to 18.1 ± 0.2 times.
- Demonstrated single-photon emission decay times in the tens of picoseconds.
- Successfully observed spatial patterns of generated single-photon beams corresponding to different LG modes.
Conclusions:
- Developed a method for direct generation of single-photon Laguerre-Gaussian (LG) beams using quantum dots in a microcavity.
- The approach significantly enhances single-photon emission rates, paving the way for high-brightness sources.
- Findings support the development of advanced quantum photonic devices for communication and sensing.
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