Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Superconducting Electronics: SQUIDs, Qubits, Circuit QED I
TT 38.6: Vortrag
Mittwoch, 19. März 2025, 18:00–18:15, H32
Characterization of stacked Josephson junction arrays for the Josephson Arbitrary Waveform Synthesizer with integrated on-chip power dividers — •Omar M. Aladdin1, Oliver Kieler1, Abdulrahman Widaa1, Hannes Preißler1, Erasmus Wolf2, Marco Schubert2, 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) is based on pulse-driven Josephson junction (JJ) arrays and provides precisely controlled, spectrally pure quantum-based AC voltages with low noise and no drift. Being widely used at National Metrology Institutes, increasing the output voltage of JAWS might significantly expand its application range. In this contribution, we describe our current efforts towards reaching JAWS output voltage of 1 V RMS. We are improving the existing on-chip RF power dividers enabling up to 8 parallel JJ arrays to operate simultaneously per chip with sufficient operation margins. Additionally, we are increasing the number of active junctions by means of fabricating of up to 5-stacked SNS-type JJ with NbxSi1−x as barrier material. The target is to integrate about 50 000 to 60 000 JJ per chip. The circuit layout with integrated on-chip power dividers, the fabrication technology and first measurement results will be presented at the conference.
Keywords: AC Josephson voltage standard; Josephson arbitrary waveform synthesizer (JAWS); stacked Josephson junctions; Wilkinson power divider