Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.9: Poster

Monday, March 9, 2026, 18:00–20:00, P1

Towards next-generation Josephson arbitrary waveform synthesizers — •Nishtha Chaudhry, Oliver Kieler, Abdulrahman Widaa, Michael Haas, Omar M. Aladdin, and Johannes Kohlmann — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

With the rapid emergence of new quantum technologies, there is a crucial need for cryogenic microwave generation and detection systems that eliminate additional noise and improve signal quality. We put forward the Josephson Arbitrary Waveform synthesizer (JAWS) as a drive-signal source for these quantum devices for ultrabroadband operation at cryogenic temperatures. The JAWS consists of a pulse-driven series array of Niobium-based SNS Josephson junctions. JAWS delivers ultra-precise, quantum-accurate quantized arbitrary waveforms with exceptional spectral purity of up to -125 dBc and extremely low noise or voltage drift. In this conference presentation, we will introduce the current effort at PTB in which we are extending the operation of previously established JAWS circuits to temperatures as low as 1 K by exploring different substrate options and optimizing parameters of the Josephson junctions. The JAWS chips will be able to provide four different signal channels from DC to GHz and can also be placed close to the quantum chips at cryogenic temperatures.

Keywords: Superconductivity; Josephson Junctions; Arbitrary Waveform Synthesizer; Microwave; Low noise signal