Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1

TT 31.5: Vortrag

Mittwoch, 18. März 2020, 10:30–10:45, HSZ 03

Development of RF-Power Dividers for the Josephson Arbitrary Waveform Synthesizer — •Hao Tian, Oliver Kieler, Ralf Behr, Rüdiger Wendisch, Rolf-Werner Gerdau, Karsten Kuhlmann, and Johannes Kohlmann — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

The JAWS, based on pulse-driven series arrays of SNS Josephson Junctions (JJs) at 4 K, enables spectrally pure AC voltages to be synthesized from DC up to MHz. To simplify the experimental set-up and to increase the JJs operated by a single PPG channel, we designed two types of on-chip power dividers. One type is a two-stage serial-parallel power divider, the second type is a one-stage Wilkinson power divider. The outputs of the power dividers are equipped with DC-block capacitors and LCR filters. Different designs were simulated, integrated to JJs arrays and fabricated. The results showed that the test chips containing a 2-stage serial-parallel power divider and 2000 JJs are operational up to a maximum clock frequency of 13 GHz. Spectrally pure sinusoidal waveforms of 19 mV (RMS) could be synthesized with sigma-delta code amplitudes of 50%. The 1-stage Wilkinson power divider integrated with 1000 JJs and 3000 JJs can operate up to a clock frequency of 15 GHz. We successfully synthesized spectrally pure output voltages of 17.6 mV (RMS) and 33 mV (RMS). This work was partly supported by the EMPIR programme co-financed by the Participating States and from the EU H2020 programme (JRP 15SIB04 QuADC) and by the German BMWi (project ZF4104104AB7).

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