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TT: Fachverband Tiefe Temperaturen
TT 28: Superconducting Electronics: SQUIDs and other Josephson Circuits and Components
TT 28.9: Vortrag
Dienstag, 10. März 2026, 11:45–12:00, CHE/0089
Towards 1 V Josephson Arbitrary Waveform Synthesizer — •Omar M. Aladdin1, Oliver Kieler1, Abdulrahman Widaa1, Hannes Preißler1, Erasmus Wolf2, Marco Schubert2, Judith Felgner1, Rolf-Werner Gerdau1, Johannes Kohlmann1, and Mark Bieler1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2Supracon AG, An der Lehmgrube 11, 07751 Jena, Germany
The Josephson Arbitrary Waveform Synthesizer (JAWS) provides quantum-accurate AC voltage waveforms with high spectral purity, low noise, and inherent long-term stability. Based on pulse-driven Josephson junction (JJ) arrays, JAWS is established as the primary AC voltage standard. Recent JAWS developments at PTB include increasing the output voltage per chip, targeting 1 V RMS to advance its use in high-accuracy metrological applications [1]. Current efforts focus on enhancing the JAWS fabrication process to enable larger array sizes using 5-stacked JJ arrays. The stacked junction technology is combined with improved on-chip Wilkinson power dividers, allowing the incorporation of more than two JJ arrays on one chip [2]. The power dividers have been successfully demonstrated with 3-stacked JJ arrays achieving 600 mV RMS per JAWS chip with a total of 36,000 junctions. In this contribution, we present the recent results of 5-stacked JJ arrays and Wilkinson power dividers with up to 60,000 JJs per JAWS chip.
[1] DOI: 10.1016/B978-0-323-90800-9.00001-9
[2] DOI: 10.1109/TASC.2021.3055161
Keywords: AC Josephson voltage standard; Digital-to-analog conversion; SNS Josephson junction; Wilkinson power divider; Signal synthesis