Quantum metrological triangle experiment at LNE: measurements on a three-junction R-pump using a 20 000:1 winding ratio cryogenic current comparator

Devoille, Laurent; Feltin, Nicolas; Steck, B.; Chenaud, Boris; Sassine, S.; Djordevic, S.; Seron, O.; Piquemal, F.

doi:10.1088/0957-0233/23/12/124011

Cited by 32 publications

(26 citation statements)

References 30 publications

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“…[101]. b) Schematic of LNE experiment to close the metrological triangle [81,102]. The current generated by a metallic pump I pump is amplified by a factor 20000 using a cryogenic current comparator (CCC).…”

Section: Closure Of the Metrological Trianglementioning

confidence: 99%

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The ampere and the electrical units in the quantum era

Poirier

Djordjevic

Schopfer

et al. 2019

Comptes Rendus. Physique

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By fixing two fundamental constants from quantum mechanics, the Planck constant h and the elementary charge e, the revised Système International (SI) of units endorses explicitly quantum mechanics. This evolution also highlights the importance of this theory which underpins the most accurate realization of the units. From 20 May 2019, the new definitions of the kilogram and of the ampere, based on fixed values of h and e respectively, will particularly impact the electrical metrology. The Josephson effect (JE) and the quantum Hall effect (QHE), used to maintain voltage and resistance standards with unprecedented reproducibility since 1990, will henceforth provide realizations of the volt and the ohm without the uncertainties inherited from the older electromechanical definitions. More broadly, the revised SI will sustain the exploitation of quantum effects to realize electrical units, to the benefit of end-users. Here, we review the state-of-the-art of these standards and discuss further applications and perspectives.

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Section: Closure Of the Metrological Trianglementioning

confidence: 99%

“…From ref. [102]. devices was measured by using a secondary resistor (or capacitor) calibrated from R K , whose voltage at its terminals was compared to a Josephson voltage reference.…”

Section: Closure Of the Metrological Trianglementioning

confidence: 99%

The ampere and the electrical units in the quantum era

Poirier

Djordjevic

Schopfer

et al. 2019

Comptes Rendus. Physique

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“…It allows room-temperature detection, and that JVS, SET, and QHR can be operated in different refrigerators. This type of effort has been described by Piquemal (2004), Piquemal (2009), Feltin et al (2011), and Devoille et al (2012). Another approach is to use a high-value cryogenic resistor that is calibrated against the QHR with the help of a CCC (Elmquist, Zimmerman, and Huber, 2003;Manninen et al, 2008).…”

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confidence: 99%

Single-electron current sources: Toward a refined definition of the ampere

et al. 2013

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The control of electrons at the level of the elementary charge e was demonstrated experimentally already in the 1980s. Ever since, the production of an electrical current ef, or its integer multiple, at a drive frequency f has been a focus of research for metrological purposes. This review discusses the generic physical phenomena and technical constraints that influence single-electron charge transport and presents a broad variety of proposed realizations. Some of them have already proven experimentally to nearly fulfill the demanding needs, in terms of transfer errors and transfer rate, of quantum metrology of electrical quantities, whereas some others are currently ''just'' wild ideas, still often potentially competitive if technical constraints can be lifted. The important issues of readout of singleelectron events and potential error correction schemes based on them are also discussed. Finally, an account is given of the status of single-electron current sources in the bigger framework of electric quantum standards and of the future international SI system of units, and applications and uses of single-electron devices outside the metrological context are briefly discussed.

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“…High precision current measurement and up-scaling instrumentation, based on new cryogenic current comparator (CCC) systems with high winding ratios, are being developed at PTB (up to 17 000:1) [25] and at LNE (up to 30 000:1) [26][27][28][29]. These systems aim at measuring quantum generated currents of the order of 100 pA at an accuracy level of one part in 10 7 .…”

Section: Quantum Current Measurement Instrumentationmentioning

confidence: 99%

Introducing Joint Research Project «Quantum Ampere» for the realisation of the new SI ampere

Scherer

Giblin

Jehl

et al. 2014

EPJ Web of Conferences

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Abstract.The metrology community lately has adopted the long-term aim of basing the SI unit system on fundamental constants of nature. The base electrical unit, the ampere, will then be re-defined in terms of a fixed value of the elementary charge e. The most direct realization of the new ampere definition requires controlling the number of electrons which flow in a unit time interval, and of counting the errors occurring in this process of clocking single electrons. State of the art nanofabrication technology allows the fabrication of single-electron transport devices -known as single-electron pumps -which generate electric current by moving electrons one at a time. These devices are capable of delivering currents of about 100 pA with an accuracy at the 1 part per million level. Also, ultrasensitive single-electron detectors have been explored that allow electric charge detection on a resolution level below e. The European Joint Research Project presented here, undertaken by a consortium of several research institutes, aims at further developing the best existing concepts of single-electron pumps and to combine them with single-electron detectors for creating highly accurate quantum current sources, to be used as future current standards. Furthermore, necessary current measurement instrumentation will be developed. The paper comprises the project aims and the main results achieved so far.

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Quantum metrological triangle experiment at LNE: measurements on a three-junction R-pump using a 20 000:1 winding ratio cryogenic current comparator

Cited by 32 publications

References 30 publications

The ampere and the electrical units in the quantum era

The ampere and the electrical units in the quantum era

Single-electron current sources: Toward a refined definition of the ampere

Introducing Joint Research Project «Quantum Ampere» for the realisation of the new SI ampere

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