A Josephson array voltage standard at 10 V

Lloyd, F. L.; Hamilton, C.A.; Beall, James A.; Go, D.; Ono, Ronald H.; Harris, Richard E.

doi:10.1109/edl.1987.26690

Cited by 59 publications

(22 citation statements)

References 7 publications

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“…Second, all the steps can be selected with the same bias current (I ∼ 0), and the array can be disconnected from the bias source during the measurements. This relaxes, to some extent, the need of perfectly identical JJ parameters in the arrays, and for this reason it allowed the fabrication of the first 10 V arrays of JJ [108,109].…”

Section: Conventional Devicesmentioning

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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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: Conventional Devicesmentioning

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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“…Despite being beyond the scope of the present work, this remains an interesting issue that would require further investigation. Figure 4(a) shows the emitted radiation power spectrum for a chain of N = 10 3 Nb/AlOx/Nb rectangular junctions 14,17,30,31 driven by a 100 MHz oscillating magnetic field. As we can see, the device is able to provide a power of about 10 pW at 50 GHz (corresponding to the 500-th har- monic of the driving frequency).…”

Section: Numerical Resultsmentioning

confidence: 99%

Radiation comb generation with extended Josephson junctions

Solinas

Bosisio

Giazotto³

2015

Journal of Applied Physics

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We propose the implementation of a Josephson radiation comb generator (JRCG) based on an extended Josephson junction subject to a time dependent magnetic field. The junction critical current shows known diffraction patterns and determines the position of the critical nodes when it vanishes. When the magnetic flux passes through one of such critical nodes, the superconducting phase must undergo a π-jump to minimize the Josephson energy. Correspondingly a voltage pulse is generated at the extremes of the junction. Under periodic driving this allows us to produce a comb-like voltage pulses sequence. In the frequency domain it is possible to generate up to hundreds of harmonics of the fundamental driving frequency, thus mimicking the frequency comb used in optics and metrology. We discuss several implementations through a rectangular, cylindrical and annular junction geometries, allowing us to generate different radiation spectra and to produce an output power up to 10 pW at 50 GHz for a driving frequency of 100 MHz.

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“…Continued improvements in lithography and materials resulted in improved yield for these circuits with larger numbers of junctions [11]. For example, IBM's Josephson computer project led to improved junction oxide barriers and PbInAu superconducting electrodes [12].…”

Section: Introductionmentioning

confidence: 99%

Nanotechnology for next generation Josephson voltage standards

Benz

Dresselhaus

Burroughs

2001

IEEE Trans. Instrum. Meas.

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We have developed two voltage standard systems: 1) the programmable Josephson voltage standard and 2) the Josephson arbitrary waveform synthesizer. The programmable system is fully automated and provides stable programmable dc voltages from 1.2 V to +1.2 V. The synthesizer is the first quantum-based ac voltage standard source. It uses perfectly quantized Josephson pulses to generate arbitrary waveforms with low harmonic distortion and stable, calculable time-dependent voltages. Both systems are presently limited to output voltages less than 10 V as a result of frequency requirements and the limits of junction fabrication technology. We describe the development of fabrication technology for these systems and describe the circuit-and fabrication-related constraints that presently limit system performance. Finally, we propose the use of lumped arrays of junctions to achieve higher practical voltages through development of a nanoscale junction technology, in which 13 000 junctions are closely spaced at 50 nm-100 nm intervals.

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A Josephson array voltage standard at 10 V

Cited by 59 publications

References 7 publications

The ampere and the electrical units in the quantum era

The ampere and the electrical units in the quantum era

Radiation comb generation with extended Josephson junctions

Nanotechnology for next generation Josephson voltage standards

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