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Abstract
We present the metrological characterization of a single-photon source based on a germanium-vacancy center in diamond under a solid immersion lens in a confocal microscope setup at room temperature. It was characterized in terms of the emission’s spectral distribution, single-photon purity, temporal stability and the emitter’s excited state lifetime and saturation behavior. An Allan deviation analysis was performed on the emission of the single-photon source to determine the optimal averaging time of the photon flux. The single-photon source was used for the relative calibration of the detection efficiency of two single-photon avalanche diode detectors. The results were compared with measurements using attenuated laser light for the calibration of the detectors.
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Details
1 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany; Laboratory for Emerging Nanometrology, Langer Kamp 6a/b, 38106 Braunschweig, Germany
2 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
3 Laboratory for Emerging Nanometrology, Langer Kamp 6a/b, 38106 Braunschweig, Germany; Technische Universität Braunschweig , Universitätsplatz 2, 38106 Braunschweig, Germany
4 Ruder Bošković Institute , Bijenička cesta 54, 10000 Zagreb, Croatia
5 Physics Department, University of Torino , Via P. Giuria 1, 10125 Torino, Italy; Istituto Nazionale di Ricerca Metrologica (INRiM) , Strada delle Cacce, 91, 10135 Torino, Italy; Istituto Nazionale di Fisica Nucleare (INFN) , Via P. Giuria 1, 10125 Torino, Italy