Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Conference on Precision Electromagnetic Measurements

Towards an Improved Programmable Quantum Current Generator

J. Azib, J. Brun-Picard, F. Schopfer, W. Poirier, Sophie Djordjevic

Published Jul 1, 2018• 3 citations
Publisher

Abstract

We report on a noise characterization and some on-going improvements of a programmable quantum current generator (PQCG) based on the extension of Ohm's law to quantum standards.
DOI
10.1109/cpem.2018.8501115

Related papers

Next generation Programmable Quantum Current Generator

Sophie Djordjevic, Ralf Behr, W. Poirier

This paper describes the latest improvements of the programmable quantum current generator (PQCG), which allow to get rid of the former 10−7relative corrections due to the resistance of the cable and extend the realization of the ampere over a wider current range, down to the µA range. Here we report on the first results of accuracy tests at 46 µA with a measurement uncertainty of one part in 108.

Conference on Precision Electromagnetic Measurements•Jul 8, 2024•0 citations

A7.3 - New developments for the programmable quantum current generator

Nils Huntemann, S. S. Djordjevic, W. Poirier

Lectures•Jan 1, 2023•0 citations

Towards a programmable quantum current generator

J. Brun-Picard, D. Leprat, F. Schopfer +2 more

We report on the development of a programmable quantum current generator (PQCG) based on quantum voltage and resistance standards. First measurements with a digital amperemeter in the 100 μA range demonstrate the linearity of the generated current as a function of the theoretical current, linked to the electron charge, with a relative uncertainty of 2.7 × 10-7(k = 1). To overcome the detector limits and validate the PQCG as a practical realization of the ampere in the new SI, accurate quantization measurements with a target combined uncertainty of a few parts in 108are in progress.

Conference on Precision Electromagnetic Measurements•Jul 1, 2016•0 citations

Comparison of the Programmable Quantum Current Generator and an Ultrastable Low-Noise Current Amplifier

Sophie Djordjevic, W. Poirier, D. Drung +1 more

The 2019 revision of the International System of Units motivated different practical realizations of the ampere according to the corresponding Mise en pratique. Independently, the national metrology institutes of France and of Germany realized the unit ampere by using Ohm's law and practical realizations of volt and ohm by means of Josephson or quantum Hall effects, respectively. In this work, we present the results of the first direct comparison of both setups with the focus on currents at the level of 50 μA and 50 nA. The relative deviations are (4±3)×10-7and (14±6.5)×10-7respectively.

Conference on Precision Electromagnetic Measurements•Aug 1, 2020•2 citations

Precise Quantum Angle Generator Designed for Noisy Quantum Devices

Schnake, Simon Patrik, Rehm, Florian, Krücker, Dirk +4 more

Pos proceedings of science•Jan 1, 2024•0 citations

A primary quantum current standard based on the Josephson and the quantum Hall effects

Sophie Djordjevic, Ralf Behr, W. Poirier

The new definition of the ampere calls for a quantum current standard able to deliver a flow of elementary charges, e, controlled with a relative uncertainty of 10−8. Despite many efforts, nanodevices handling electrons one by one have never demonstrated such an accuracy for a net flow. The alternative route based on applying Ohm’s law to the Josephson voltage and quantum Hall standards recently reached the target uncertainty in the milliampere range, but this was at the expense of the application of error corrections. Here, we present a new programmable quantum current generator, which combines both quantum standards and a superconducting cryogenic amplifier in a quantum electrical circuit enabling the current scaling without errors. Thanks to a full quantum instrumentation, we demonstrate the accuracy of the generated currents, in the microampere range, at quantized values, ±(n/p)efJ, with relative uncertainties less than 10−8, where n and p are integer control parameters and fJ is the Josephson frequency. This experiment sets the basis of a universal quantum realization of the electrical units, for example able of improving high-value resistance measurements and bridging the gap with other quantum current sources. Realizing the ampere, the unit of electrical current, involves controlling a flow of elementary charges with high accuracy. Here, the authors present the generation of sizeable currents at quantized values with relative uncertainties below 10−8.

arXiv:2407.12562•Nature Communications•Feb 10, 2025•10 citations
We report on the development of a programmable quantum current generator (PQCG) based on quantum voltage and resistance standards. First measurements with a digital amperemeter in the 100 μA range demonstrate the linearity of the generated current as a function of the theoretical current, linked to the electron charge, with a relative uncertainty of 2.7 × 10-7(k = 1). To overcome the detector limits and validate the PQCG as a practical realization of the ampere in the new SI, accurate quantization measurements with a target combined uncertainty of a few parts in 108are in progress.
The 2019 revision of the International System of Units motivated different practical realizations of the ampere according to the corresponding Mise en pratique. Independently, the national metrology institutes of France and of Germany realized the unit ampere by using Ohm's law and practical realizations of volt and ohm by means of Josephson or quantum Hall effects, respectively. In this work, we present the results of the first direct comparison of both setups with the focus on currents at the level of 50 μA and 50 nA. The relative deviations are (4±3)×10-7and (14±6.5)×10-7respectively.
The new definition of the ampere calls for a quantum current standard able to deliver a flow of elementary charges, e, controlled with a relative uncertainty of 10−8. Despite many efforts, nanodevices handling electrons one by one have never demonstrated such an accuracy for a net flow. The alternative route based on applying Ohm’s law to the Josephson voltage and quantum Hall standards recently reached the target uncertainty in the milliampere range, but this was at the expense of the application of error corrections. Here, we present a new programmable quantum current generator, which combines both quantum standards and a superconducting cryogenic amplifier in a quantum electrical circuit enabling the current scaling without errors. Thanks to a full quantum instrumentation, we demonstrate the accuracy of the generated currents, in the microampere range, at quantized values, ±(n/p)efJ, with relative uncertainties less than 10−8, where n and p are integer control parameters and fJ is the Josephson frequency. This experiment sets the basis of a universal quantum realization of the electrical units, for example able of improving high-value resistance measurements and bridging the gap with other quantum current sources. Realizing the ampere, the unit of electrical current, involves controlling a flow of elementary charges with high accuracy. Here, the authors present the generation of sizeable currents at quantized values with relative uncertainties below 10−8.