Mainz 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 11: QuanTour I – Single Photons & Foundations
Q 11.6: Talk
Monday, March 2, 2026, 18:30–18:45, P 7
Wigner functions of pure photonic states emitted by quantum dot sources — •Hubert Lam1, Petr Steindl1, Yann Portella1, Juan R. Álvarez2, Kiarn Laverick3, Anton Pishchagin4, Thi Huong Au4, Sébastian Boissier4, Aristide Lemaître1, Alexia Auffèves3, Dario A. Fioretto1,4, and Pascale Senellart-Mardon1 — 1Centre de nanosciences et de nanotechnologies, Palaiseau, France — 2Télécom Paris, Palaiseau, France — 3MajuLab, Singapore — 4Quandela, Massy, France
Semiconductor quantum dots are excellent on-demand single-photon sources. Coupled to optical cavities, they emit pure, indistinguishable photons at high rates. While such sources have mainly been used for discrete-variable photonic quantum information processing, their ability to generate complex non-Gaussian states and provide strong single-photon nonlinearity positions them as promising resources for continuous-variable (CV) protocols as well.
We take a first step toward using cavity-coupled quantum dots as CV resources. We measure the Wigner functions of single-photon and photon-number superposition states from our emitter, achieving purities above 90 %. This is enabled by adapting homodyne-like displacement techniques to the high-brightness regime of our source.
These results demonstrate that quantum-dot sources can be harnessed for the generation and engineering of non-Gaussian states and pave the way for continuous-variable quantum information processing with optical solid-state emitters.
Keywords: Quantum dot sources; Wigner function; Non-Gaussianity