Optimized 1 V and 10 V Josephson series arrays

Müller, F.; Pöpel, R.; Kohlmann, J.; Niemeyer, J.; Meier, Wolfgang; Weimann, T.; Grimm, L.; Dunschede, F.-W.; Gutmann, P.

doi:10.1109/19.571819

Cited by 26 publications

(13 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microwave circuit. Typical 10 V Josephson voltage standards are composed of about 14000 to 20000 Josephson junctions [116,117]. To reach 10 V, high order constant voltage steps are exploited (typically, at 10 V, a JVS of 14000 JJ works in average on the voltage step n = 5).…”

Section: Conventional Devicesmentioning

confidence: 99%

The ampere and the electrical units in the quantum era

Poirier

Djordjevic

Schopfer

et al. 2019

Comptes Rendus. Physique

View full text Add to dashboard Cite

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.

show abstract

Section: Conventional Devicesmentioning

confidence: 99%

The ampere and the electrical units in the quantum era

Poirier

Djordjevic

Schopfer

et al. 2019

Comptes Rendus. Physique

View full text Add to dashboard Cite

show abstract

“…Josephson Junction Array (JJA) chip: The JJA chips which are being used for the measurements were fabricated by PTB, Germany (one of the author's (VNO) has some experience in fabricating them at PTB, Germany) using the modified design and technology developed by them [2]. The present chip has more than 13,000 Nb/Al 2 O 3 /Nb tunnel junctions.…”

Section: System Configurationmentioning

confidence: 99%

10 volt Josephson series array voltage standard at NPL, India

Ojha

Sharma

Jaiswal

2008

2008 Conference on Precision Electromagnetic Measurements Digest

View full text Add to dashboard Cite

show abstract

“…Motivated by the reliable Nb-Al technology successfully established throughout the 1990s for the fabrication of conventional 10 V SIS JVSs at PTB [8] [9], the intrinsically shunted SINIS Josephson junctions (S = Nb, I = AlO x , N = Al) composed of two very transparent AlO x barriers quickly moved into the focus of the PTB researchers. The double-barrier structure of this junction type can be easily tuned to 70 GHz.…”

Section: Development Of Robust Josephson Junctions Suitable For 70 Ghmentioning

confidence: 99%

“…array segments can present a higher attenuation than longer and active subarrays. On the other hand, experience previously collected with SIS arrays for conventional JVSs [8] suggest that the maximum microwave attenuation should not exceed 5 dB to ensure a sufficiently homogeneous distribution of the rf power. As a result, the maximum number of Nb x Si 1−x barrier junctions in a single and actively driven stripline should be about 550.…”

Section: Ghz Design Of Microstriplines With Embedded Nbxsi1−x Barrmentioning

confidence: 99%

Microwave Design and Performance of PTB 10 V Circuits for the Programmable Josephson Voltage Standard

Müller¹,

Scheller²,

Lee³

et al. 2014

WJCMP

View full text Add to dashboard Cite

At Physikalisch-Technische Bundesanstalt (PTB), superconducting 10 V circuits for the programmable Josephson voltage standard (PJVS) are routinely manufactured on the basis of NbxSi1−x barrier junctions. This paper describes in detail the basic design principles for an operating frequency of 70 GHz. It starts with single junctions, discusses their insertion into microstriplines and closes with the whole microwave circuit containing 69,632 NbxSi1−x barrier junctions arranged over 128 microstriplines connected in parallel. The microwave attenuation of this junction type is a key parameter for the 10 V design and we report its experimental determination. Special attention has been devoted to subarrays with just a few Josephson junctions in one of the outermost striplines. The arrangement of these subarrays determines the optimum performance of the complete 10 V series array. The high performance of programmable 10 V circuits fabricated at PTB is characterized by measured operating margins in all subarrays of more than 1 mA centered at the same dc bias current. The observed modulation of the current margins, when changing the frequency around 70 GHz, is explained by microwave reflections caused by the rf waveguide inside the cryoprobe. We determine the current margins in dependence of the output power of a microwave synthesizer and show that 60 mW is sufficient to achieve current margins larger than 1 mA.

show abstract

Optimized 1 V and 10 V Josephson series arrays

Cited by 26 publications

References 9 publications

The ampere and the electrical units in the quantum era

The ampere and the electrical units in the quantum era

10 volt Josephson series array voltage standard at NPL, India

Microwave Design and Performance of PTB 10 V Circuits for the Programmable Josephson Voltage Standard

Contact Info

Product

Resources

About