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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.78: Poster

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

Calibrating Photodiodes using Quantum Metrology — •Leif Albers, Jan-Malte Michaelsen, and Roman Schnabel — Institut für Quantenphysik und Zentrum für Optische Quantentechnologien Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Quantum sensing and optical quantum computing require highly efficient and well-calibrated photodiodes and balanced homodyne detectors. We further develop our quantum metrology technique for calibrating photodiodes using squeezed light [1]. It fundamentally relies on the Heisenberg uncertainty relation, eliminating the need for calibrated spectral references or cryogenic radiometers. Using squeezed states with a moderately high squeeze factor of 10 (10 dB), we significantly reduce experimental requirements compared to previous work with 15 dB of squeezing [1], while enabling direct, in situ measurements of quantum efficiency. We demonstrate our method by calibrating commercial photodiodes for 1550 nm with an uncertainty of ± 0.4 %.
[1] H. Vahlbruch et al., Phys. Rev. Lett. 117, 110801 (2016)

Keywords: Photodiode Calibration; Quantum Metrology; Quantum Sensing; Squeezed States