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Q: Fachverband Quantenoptik und Photonik
Q 11: QuanTour I – Single Photons & Foundations
Q 11.2: Vortrag
Montag, 2. März 2026, 17:15–17:30, P 7
QuanTour at PTB: a metrologist‘s perspective — •Hristina Georgieva1, Lisa Quack1, Marco López1, Stefan Kück1, Lucas Rickert2, Doris Reiter3, and Tobias Heindel4 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Technische Universität Berlin, Berlin, Germany — 3Technische Universität Dortmund, Dortmund, Germany — 4Department für Quantentechnologie, Universität Münster, Münster, Germany
QuanTour is an outreach project in which a quantum emitter is sent to different universities and research institutions worldwide, enabling comparative measurements on the same chip. We present the results obtained at PTB. We measured the emission spectrum, the decay time and the excitation-power-dependent g(2)(0) value of the single-photon emitter based on a quantum dot in a circular Bragg grating. The core of our self-built confocal microscope is a set of high-transmission spectral filters. In contrast to the common use of a monochromator for the spectral filtering, this approach provides high count rates at the single-photon detector, while maintaining a low multiphoton probability. Moreover, consistent with observations from other project partners, we measured a tenfold improvement of the g(2)(0) under p-shell excitation compared with non-resonant excitation. This combination of high photon flux and low g(2)(0) is particularly relevant for the calibration of single-photon detectors. In addition, the demonstrated robustness and durability of the quantum emitter throughout the project is highly valuable for ensuring reliable and reproducible measurements in the field of quantum metrology.
Keywords: QuanTour; quantum dot; single-photon emitter; metrology