Quantum 2025 – scientific programme

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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.71: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

High resolution event time tagger with outstanding timing precision, user selectable trigger methods, and flexible interfacing — Florian Weigert, Tino Röhlicke, Hans-Jürgen Rahn, Nicolai Adelhöfer, Torsten Krause, •Torsten Langer, and Michael Wahl — PicoQuant GmbH, Berlin, Germany

The presented FPGA-based device Time-Correlated Single Photon Counting (TCSPC) and time tagging offers a digital time resolution of 1 ps, a timing uncertainty of 2 ps rms and a sub-nanosecond dead time, with multiple input channels. Flexible trigger methods, including a constant fraction discriminator (CFD), enable adaptation to different detector types such as SNSPDs. A high-bandwidth external FPGA interface allows pre-processing of time tags, while white rabbit synchronization provides precise synchronization over long distances. Control is via a user-friendly GUI or a Python API that supports real-time visualization and data analysis. With low jitter, high channel count rates and precise synchronization, the device is an ideal building block for applications in optical quantum research like characterization of non-classical light emitters or long-distance quantum key distribution.

Keywords: Time tagging; Photon correlation; Coincidence detection; White Rabbit; Quantum Key Distribution