Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Superconducting Electronics: SQUIDs and other Josephson Circuits and Components

TT 28.10: Talk

Tuesday, March 10, 2026, 12:00–12:15, CHE/0089

Study on the feedthrough error in quantum-based superconducting RF waveform generators — •Michael Haas, Abdulrahman Widaa, Oliver Kieler, Marco Kraus, Ralf Behr, Johannes Kohlmann, and Mark Bieler — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Quantum-based signal generators are of great interest for a variety of applications such as electrical metrology or quantum computing. The Josephson Arbitrary Waveform Synthesizer (JAWS) consisting of an array of Josephson junctions is one of such devices. It allows the generation of arbitrary, low-noise waveforms with high spectral purity by utilizing the Josephson effect. This approach is well established for signal frequencies in the kHz to low MHz range. However, modern applications typically demand increasing signal frequencies, reaching the microwave range. To satisfy the need for higher JAWS output frequencies, modified circuit designs and bias schemes are necessary. This is mainly because of the so-called feedthrough error, which denotes an input signal being fed through to the output. We will present recent developments of GHz-JAWS at PTB, comprising detailed investigations on the feedthrough error and methods for its reduction.

Keywords: Josephson junction; JAWS; Mircowave; Waveform Generator; Diplexer