Josephson Junctions for Present and Next Generation Voltage Metrology

Lacquaniti, V.; Sosso, A.

doi:10.5772/36429

Cited by 2 publications

(2 citation statements)

References 57 publications

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“…Unfortunately, the generation of ac voltages of similar accuracy is difficult because the output voltage cannot change unless at relatively low rate. Instead, the one-toone current-voltage (IV ) relationship [3] in Programmable Josephson Voltage Standards (PJVS) under microwave irradiation makes it possible to suitably control the voltage by setting the junction bias current. They are realized with many Josephson junctions, connected in series and subdivided in sub-circuits following a power-of-two rule: the total voltage across all sections can thus be binary programmed, equivalently to the technique used in electronic digital-to-analog converters.…”

Section: Introductionmentioning

confidence: 99%

Verification of thermal converters by means of a pulsed Josephson standard

Kubiczek,

Durandetto,

Capra

et al. 2023

Proceedings of the 26th IMEKO TC4 International Symposium and 24th International Workshop on ADC/DAC Modelling and Testing

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Starting from 2019 a new central role is played by quantum standards, owing to the redefined SI [1], where electrical units are directly linked to the fundamental constants e (elementary charge) and h (Planck constant). Thus, metrologists are nowadays trying to extend the astonishing accuracy attainable in dc measurements to ac and beyond, moving from sinusoidal toward quantum calibrations of arbitrary signals. Programmable Josephson Voltage Standards are nowadays capable of fulfilling primary metrology requirements only for signals up to few hundreds Hz. Pulsed Josephson standard are instead capable of generating arbitrary waveforms at higher frequencies, so are generally called Josephson Arbitrary Waveform Standards (JAWS). In particular, the capability of generating high spectral purity signals allows high accuracy measurements of the ac-dc difference of thermal converters. We report in the following about our setup for quantum calibrations of thermal converters, first results obtained and open issues.

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Section: Introductionmentioning

confidence: 99%

Verification of thermal converters by means of a pulsed Josephson standard

Kubiczek,

Durandetto,

Capra

et al. 2023

Proceedings of the 26th IMEKO TC4 International Symposium and 24th International Workshop on ADC/DAC Modelling and Testing

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“…overlapping voltage steps with current range that spans positive and negative values, hence including the condition of zero dc bias. The current-voltage (IV ) relationship is then not one-to-one [4] and it is not possible to control the voltage through electrical bias.…”

Section: Introductionmentioning

confidence: 99%

Advancements in quantum voltage standards for time-dependent signals

Durandetto¹,

Serazio²,

Sosso³

2022

Proceedings of the 25th IMEKO TC4 International Symposium and 23rd International Workshop on ADC and DAC Modelling and Testing

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Quantum voltage standards based on acJosephson effect are in use in metrology since just a few years after the discovery of the physical effect. The role of quantum standards is now crucial following the SI redefinition in 2019 [1]: electrical units are now defined in function of the fundamental constants e (elementary charge) and h (Planck's constant). The extremely low uncertainty in dc measurements, that can be below 1 nV/V at 10 V [2], is stimulating research to extend application to ac and signals arbitrarily changing with time. Approaching the dc accuracy is challenging, however. The two main technologies used for the generation of non-steady voltage signals are programmable and pulsed Josephson junction arrays. In the following we discuss the main advancements obtained with both technologies and the most recent developments, in particular the advantages of He-free device cooling techniques.

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Josephson Junctions for Present and Next Generation Voltage Metrology

Cited by 2 publications

References 57 publications

Verification of thermal converters by means of a pulsed Josephson standard

Verification of thermal converters by means of a pulsed Josephson standard

Advancements in quantum voltage standards for time-dependent signals

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