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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster III

Q 42.28: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Feed-forward for optical circuits with cryogenic electronics — •Niklas Lamberty, Thomas Hummel, Frederick Thiele, and Tim J. Bartley — Institute for Photonic Quantum Systems, Paderborn University, Germany

Many quantum optical experiments require high purity single-photon states. For this purpose, we developed a cryogenic electronic feed-forward circuit for selection of single-photon states from a PDC source. The photon number is measured using a photon number resolving superconducting detector array operated at 1 K and evaluated by an amplifier and a logic circuit based on SiGe Heterojunction Bipolar Transistor and CMOS technology. The circuit is operated in a cryostat at 2.5 K.

A total signal delay of (59±7) ns and a heatload of more than 5 mW was measured. The circuit achieved reliable selection of single photon detection events, when tested with a coherent state, and creates signals usable for a modulator driver.