Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.10: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

Characterization and Readout of Multi-Element Superconducting Single Photon Detectors — •Timon Schapeler¹, Johannes Tiedau², Vikas Anant³, Helmut Fedder⁴, Christine Silberhorn², and Tim Bartley¹ — ¹Mesoskopische Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — ²Integrierte Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — ³Photon Spot, Inc. 142 W Olive Ave, Monrovia, CA 91016, USA — ⁴Swabian Instruments GmbH, Frankenstr. 39, 71701 Schwieberdingen, Germany

The detection of single photons is the basis of many applications in quantum photonics. Increasingly, superconducting nanowire single-photon detectors (SNSPDs) are used, due to their high efficiency, low dark count rate and their high repetition rate up to the gigahertz regime. In addition, some photon-number information can be extracted using multi-element devices. We demonstrate one way to characterize the photon statistics arising from four-element SNSPDs in terms of their detection efficiency. By a comparison of experimental data and a theoretical model of a commercial four-pixel device, we were able to account for the individual detection efficiencies of each pixel. Furthermore, we demonstrate a multi-element single-channel readout scheme, based on measuring pulse length of the output of the four-pixel device with each element connected in series. This simplifies the electronic data acquisition of such devices, as well as reduces the electronic heat-load in the cryostat.