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HL: Fachverband Halbleiterphysik
HL 79: Quantum dots and wires IV
HL 79.6: Vortrag
Freitag, 20. März 2020, 11:00–11:15, POT 151
Semiconductor-based single-photon source for quantum radiometry — •Hristina Georgieva1, Marco López1, Beatrice Rodiek1, Helmuth Hofer1, Justus Christinck1, Peter Schnauber2, Arsenty Kaganskiy2, Tobias Heindel2, Sven Rodt2, Stephan Reitzenstein2, and Stefan Kück1 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany
Single-photon sources find application in many fields of quantum information processing. Therefore, there is an increasing need to ensure high accuracy and metrological traceability of measurements involving small photon fluxes. In quantum radiometry, the discrete nature of light in principle enables a direct realization of the radiometric quantities by counting photons. The narrow emission bandwidth of semiconductor quantum dots makes them perfect candidates for the detection efficiency calibration of non-photon-number-resolving detectors. We aim for a high photon flux reaching the detector area by means of an efficient quantum emitter combined with a low-loss optical setup, which uses two ultra-narrow bandpass filters instead of a monochromator to reach fluxes up to 370 kphotons/s. The optical power is determined by an unbroken calibration chain to the primary standards. Furthermore, the ratio of detection efficiencies of two single-photon avalanche photodiodes of the same type has been determined to be 1.061 ± 0.008 using a single quantum dot as a light source. This result is validated by a comparison with a standard calibration using an attenuated laser.