研究目的
To describe a new generation of Josephson Arbitrary Waveform Synthesizers that generate programmable ac waveforms with an rms amplitude of 3 V and investigate systematic errors through a null measurement.
研究成果
A cryocooled JAWS system that generates ac waveforms with an rms magnitude of 3 V and a quantum locking range at 1 kHz that is greater than 1 mA was demonstrated. A null measurement indicates that the two halves of the system agree to within 3 parts in 108, with each half generating a 1 kHz waveform with an rms magnitude of 1.5 V.
研究不足
The magnitude of the attempted null depends on which JJ arrays and bias channels are generating in-phase/out-of-phase voltages, likely due to leakage current from the compensation electronics. More extensive measurements are needed to better understand the systematic errors of this system.
1：Experimental Design and Method Selection:
The experiment involves the use of a cryocooled system with two newly designed chips to generate a 1 kHz waveform with a 3 V rms amplitude. The system's performance is tested by measuring the quantum locking range and investigating systematic errors through a null measurement.
2：Sample Selection and Data Sources:
The system uses two chips with a total of 204 960 Josephson junctions (JJs) co-located on a cryocooler.
3：List of Experimental Equipment and Materials:
The equipment includes a cryocooler, Josephson junction arrays, a commercial arbitrary waveform generator (Keysight M8195A), a 50 GHz amplifier, custom battery-powered isolation amplifiers, and a NI PXI-5922 digitizer.
4：Experimental Procedures and Operational Workflow:
The experiment involves generating a waveform, measuring the quantum locking range, and performing a null measurement to test for systematic errors.
5：Data Analysis Methods:
The output waveform is measured as a function of dc bias current using a digitizer, and the residual of the null measurement is analyzed.
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