120 Hits in 5.1 sec

The quantum vector digital voltmeter of INMETRO

Waldemar G Kuerten Ihlenfeld, Regis P Landim
2016 Journal of Physics, Conference Series  
The paper describes the quantum vector digital voltmeter developed at INMETRO, based on a programmable Josephson voltage synthesizer.  ...  some parts of 10 -07 up to frequencies of around 500 Hz.  ...  Its metrological applications explore its ability of being a nearly perfect quantum converter of frequency into a dc voltage (with typical uncertainties as low as 10 -10 V/V).  ... 
doi:10.1088/1742-6596/733/1/012079 fatcat:7f2ks4x2uvfu5jdlqirotqp5i4

Josephson voltage standards

Johannes Kohlmann, Ralf Behr, Torsten Funck
2003 Measurement science and technology  
The authors would like to thank the Josephson voltage standard team at PTB.  ...  The work within this EURAMET joint research project leading to these results was supported in part by the European Community's Seventh Framework Programme, ERA-NET Plus, under Grant Agreement 217257 (JoSy  ...  These large series arrays enable the generation of dc and ac voltages at the 10 V level, which is relevant for most applications.  ... 
doi:10.1088/0957-0233/14/8/305 fatcat:vs7qbuo4ojffdgkl5z4p3gyr3q

A modular and customizable open-source package for quantum voltage standards operation and control

Paolo Durandetto, Andrea Sosso, Archana Kamal
2018 PLoS ONE  
This paper presents an open-source package developed in Python that controls and drives a programmable Josephson array to synthesize dc and ac quantum-accurate voltages.  ...  Programmable arrays are devices subdivided into independent subsections, each counting a number of series connected Josephson junctions that follows a binary sequence (1, 2, 4, 8, ...) to control the output  ...  For a typical rf-field of 70 GHz, the voltage V J,1 across a single Josephson junction is about 145 μV, hence thousands of them are connected in series to attain practical voltages of at least 1 V.  ... 
doi:10.1371/journal.pone.0209246 pmid:30557380 pmcid:PMC6296529 fatcat:kz6l2rwr6bdk3a2c4dpav25pdi

Application of the Josephson effect in electrical metrology

B. Jeanneret, S. P. Benz
2009 The European Physical Journal Special Topics  
A detailed explanation of the operation of the conventional Josephson voltage standard and its use for dc applications will be presented, including a description of the most important results.  ...  The latter sections of this paper describe recent efforts to apply the Josephson effect to ac voltage and other electrical metrology applications.  ...  It is a real pleasure to thank C. Burroughs  ... 
doi:10.1140/epjst/e2009-01050-6 fatcat:4zujtawrdjchlbzryqcwoi3kj4

Development of Josephson voltage standards [chapter]

Johannes Kohlmann, Ralf Behr
2011 Superconductivity - Theory and Applications  
The authors would like to thank the Josephson voltage standard team at PTB.  ...  The work within this EURAMET joint research project leading to these results was supported in part by the European Community's Seventh Framework Programme, ERA-NET Plus, under Grant Agreement 217257 (JoSy  ...  These large series arrays enable the generation of dc and ac voltages at the 10 V level, which is relevant for most applications.  ... 
doi:10.5772/17031 fatcat:kuubturbdfbnlkgcyw3gsa4fzm

Index by Authors

2020 2020 Conference on Precision Electromagnetic Measurements (CPEM)  
Based on Dual-Channel Josephson Junction Array Calibration of a precision current measurement system for high AC voltages using an AC Quantum Voltmeter Quantum Electrical Standards -Josephson Voltage  ...  contribution to the International Atomic Time Time and Frequency Kohlmann, Johannes Series arrays of NbSi barrier junctions with rf power dividers for AC Josephson voltage standards Quantum Electrical  ... 
doi:10.1109/cpem49742.2020.9191903 fatcat:lbfsuf6uvzbgjpywo2lkbobx5i

Synthesizing accurate voltages with superconducting quantum-based standards

Sam Benz
2010 IEEE Instrumentation & Measurement Magazine  
S. government, not subject to copyright O ver the past three decades, the quantum behavior of superconducting Josephson junctions has been exploited to dramatically improve the accuracy of dc voltage measurements  ...  Within the past couple of years, new superconducting devices, circuits, systems and measurement techniques have been developed that have begun to impact ac voltage applications.  ...  I would like to thank all of the international collaborators, guest researchers and NIST colleagues who have contributed over the years to research in the NIST Quantum Voltage Project, in particular, Jürgen  ... 
doi:10.1109/mim.2010.5475160 fatcat:56f73qd2dfamtl5mockzoyquza

DC voltage calibrator based on an array of high-temperature superconductor josephson junctions

A.M. Klushin, A.V. Komkov, V.D. Gelikonova, S.I. Borovitskii, M. Siegel
2003 IEEE Transactions on Instrumentation and Measurement  
The calibrator is based on a quantum dc voltage which is generated by an array of high-temperature superconductor Josephson junctions.  ...  We have developed and investigated the main parts of a voltage calibrator with an output voltage up to 10 V.  ...  ACKNOWLEDGMENT The authors would like to thank O. A. Chevtchenko, A. S. Katkov, F. Piquemal, and T. Witt for helpful discussions.  ... 
doi:10.1109/tim.2003.811581 fatcat:5p2gvsfydbgjjpgskftygtop7m

Josephson voltage standard microwave circuit driven at 10 GHz

H.-G. Meyer, H.-J. Köhler, G. Wende, A. Chwala, E. Vollmer, U. Stumper, K. Blüthner, P. Weber
1994 Journal de Physique IV : Proceedings  
The circuit consists of a superconducting microstrip resonator and series arrays of Josephson junctions integrated within its rf current antinodes.  ...  At a resonator circuit with four Josephson junctions driven at 10.9 GHz we have obtained stable overlapping Shapiro steps up to 4.6 mV at a step width of about 70 pA.  ...  These improvements may provide new fields of application for voltage standard arrays, for example, as highly precise voltmeters.  ... 
doi:10.1051/jp4:1994639 fatcat:chpkfugzanfkjjvc4fp32jwkya

Josephson voltage standards

Clark A. Hamilton
2000 Review of Scientific Instruments  
This paper reviews the development and use of Josephson voltage standards over the last 30 years, including classical dc standards, programmable standards based on binary weighted arrays, pulse-driven  ...  delta-sigma standards for ac wave-form synthesis, and single-flux-quantum voltage multipliers. ͓  ...  the manuscript and the many helpful comments of Richard Kautz, Yi-hua Tang, Ronald Goldfarb, David Smith, and Barry Taylor.  ... 
doi:10.1063/1.1289507 fatcat:xakss77owfa5lhwz6wephchjcu

Application of the Josephson effect to voltage metrology

S.P. Benz, C.A. Hamilton
2004 Proceedings of the IEEE  
The unique ability of a Josephson junction to control the flow of magnetic flux quanta leads to a perfect relationship between frequency and voltage.  ...  Over the last 30 years, metrology laboratories have used this effect to greatly improve the accuracy of dc voltage standards.  ...  Yamamori (the present members of the quantum voltage project) for making possible many of these past and current results. The authors would also like to thank R.  ... 
doi:10.1109/jproc.2004.833671 fatcat:bggj4wyy5vgengozi6cbec2jvq

Thermal analysis of Josephson junctions array in cryocooler [article]

P. Durandetto, E. Monticone, B. Trinchera, L. Lolli, D. Serazio, M. Fretto, A. Sosso
2017 arXiv   pre-print
Complex cryogenics is still a strong limitation to the spread of quantum voltage standards and cryogen-free operation is then particularly interesting for Josephson standards.  ...  Indium foil between chip and Cu support was demonstrated to provide a good thermal interface suitable for programmable voltage standard operation.  ...  Presently, voltage standard research is focused on the application of Josephson arrays to ac (programmable) and arbitrary signals (pulsed).  ... 
arXiv:1609.03384v2 fatcat:aovjcvwvcnaxncufv5rw5jjqfm

1 volt DC programmable Josephson voltage standard

C.J. Burroughs, S.P. Benz, T.E. Harvey, C.A. Hamilton
1999 IEEE transactions on applied superconductivity  
The Josephson chip consists of a binary array sequence of 32 768 SNS Josephson junctions.  ...  The rapid settling time (1 µs), large operating current margins (2 to 4 mA), and inherent step stability of this new system make it superior to a conventional JVS for many dc measurements.  ...  The system uses a series array of nonhysteretic junctions, divided into a binary sequence as shown in Fig. 1 .  ... 
doi:10.1109/77.783938 fatcat:foopxrqjm5aztp5rj5vr67ynti

Ratio Calibration of a Digital Voltmeter for Force Measurement Using the Programmable Josephson Voltage Standard

Yi-hua Tang, Thomas W. Bartel, June E. Sims
2008 NCSLI Measure  
Ratio calibration of a digital voltmeter (DVM) is critical for applications such as load cell response for force measurement.  ...  The NIST JVS uses a conventional Josephson junction array which often experiences a spontaneous step transition, caused by electromagnetic interference, during its operation.  ...  In the past, it took several hours to finish a series of voltages from 5 mV to 100 mV in the manual adjustment mode.  ... 
doi:10.1080/19315775.2008.11721427 fatcat:c4w2ryemafcpdlmpsg27qatnwi

Nanotechnology for next generation Josephson voltage standards

S.P. Benz, P.D. Dresselhaus, C.J. Burroughs
2001 IEEE Transactions on Instrumentation and Measurement  
Finally, we propose the use of lumped arrays of junctions to achieve higher practical voltages through development of a nanoscale junction technology, in which 15,000 junctions are closely spaced at 50  ...  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.  ...  This work was supported in part by the Office of Naval Research. This work is a contribution of and agency of the U.S. Government work and is thus not subject to U.S. copyright.  ... 
doi:10.1109/19.982937 fatcat:7urwn4vzdvezvncznrqremg7uq
« Previous Showing results 1 — 15 out of 120 results