Josephson Based Spectrum Analyzer

Palafox, L.; Herick, Jonas; Behr, R.; Kieler, Oliver; Schubert, M.

doi:10.1109/cpem.2018.8500926

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The otherwise excellentattenuation of the notch filter at the second harmonic, −5.6 dB as opposed to −10 dB for the conventional double-T configuration, limits the resolution of these measurements. The feasibility of the Josephson-based spectrum analyzer was established by using a second JAWS to generate a given spectrum and nulling its fundamental component (Palafox et al 2018). A single shot spectrum, acquired over less than 45 s, can reach noise floors of 0.5 nV, as shown in figure 18.…”

Section: Spectrum Analysismentioning

confidence: 99%

Josephson voltage standards as toolkit for precision metrological applications at PTB

Behr

Bauer

Herick

et al. 2022

Meas. Sci. Technol.

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60 years after the discovery of the Josephson effect, electrical DC voltage calibrations are routinely performed worldwide - mostly using automated Josephson voltage standards (JVS). Nevertheless, the field of electrical quantum voltage metrology is still propagating towards AC applications. In the past 10 years the fabrication of highly integrated arrays containing more than 50 000 or even 300 000 junctions has achieved a very robust level providing highly functional devices. Such reliable Josephson arrays are the basis for many novel applications mainly focussing on precision ac measurements for signal frequencies up to 500 kHz. Two versions of quantum AC standards are being employed. Programmable Josephson voltage standards (PJVS), based on series arrays divided into subarrays, reach amplitudes up to 20 V and usually are used as quantum voltage reference in measurement systems. Pulse driven arrays reach amplitudes up to 1 V or even 4 V and are typically used as Josephson arbitrary waveform synthesizers (JAWS). This paper summarizes the principal contributions from PTB to the present state of Josephson voltage standards with particular focus on developments for precision metrological applications and our proof-of-concept demonstrations.

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Section: Spectrum Analysismentioning

confidence: 99%