NIST 10 V Programmable Josephson Voltage Standard System

Burroughs, Charles J.; Dresselhaus, Paul D.; Rüfenacht, Alain; Olaya, D.; Elsbury, Mike; Tang, Yi-hua; Benz, Samuel P.

doi:10.1109/tim.2010.2101191

Cited by 86 publications

(49 citation statements)

References 21 publications

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“…ZENER CALIBRATION SYSTEM USING 10 V PJVS PJVS behaves as a digital-to-analog (D/A) converter with quantum accuracy based on the Josephson array separated into binary segments and controlled with independent bias sources [4]. It has advantages of capability for generating arbitrary voltages and higher noise immunity compared to CJVS's.…”

Section: Introductionmentioning

confidence: 99%

Development of zener calibration system using 10 V programmable Josephson voltage standard at NMIJ

Maruyama

Iwasa

Yamamori

et al. 2014

29th Conference on Precision Electromagnetic Measurements (CPEM 2014)

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We are developing a calibration system for Zener voltage standards using a programmable Josephson voltage standard (PJVS) for the purposes of the reduction in liquidhelium consumption and also the improvement of the calibration performance. The PJVS array is composed of total 524 288 NbNbased Josephson junctions and is cooled with a 10 K compact cooler. For verifying the validity of the system, the indirect comparison between the PJVS system and our conventional JVS (CJVS) system has been carried out. As a result, the agreement within the relative expanded uncertainty of 7.8 × 10 -9 was obtained. The uncertainty in the calibration of Zener voltage standards using our PJVS system is also discussed.

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Section: Introductionmentioning

confidence: 99%

Development of zener calibration system using 10 V programmable Josephson voltage standard at NMIJ

Maruyama

Iwasa

Yamamori

et al. 2014

29th Conference on Precision Electromagnetic Measurements (CPEM 2014)

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“…Improvements in the circuit design and the fabrication process of NIST 10 V PJVS circuits [1] have enabled devices with enhanced operating margins. The circuit measured in this study has 265,116 Josephson junctions (JJs) divided into 23 sub-arrays.…”

Section: V Pjvs Arraysmentioning

confidence: 99%

“…Measured with a calibrated DVM at a 3 µV voltage threshold, these parameters are listed in a "margin table", which needs to be regularly verified to ensure the quantization performance of the PJVS. The margin table is dependent on both the microwave bias (both frequency and power) and the PJVS device temperature [1,4]. Fig.…”

Section: Pjvs Margins Measurementsmentioning

confidence: 99%

“…Below 24.5 dBm, the temperature is regulated at 4.35 K. At greater microwave bias, the dissipated power exceeds the available cooling power, the PJVS temperature increases, and the measured step width decreases due to decreasing critical current of the JJs in the subarray. We performed dither-current flat-spot measurements [1] with the 1.3 kW air-cooled compressor. With half of the junctions of the PJVS biased on the "p" step (+5 V) and the other half on the "n" or "-1" step (-5 V), the flat-spot width is reduced to 0.78 mA, compared to 1.7 mA in LHe (Fig.…”

Section: Pjvs Margins Measurementsmentioning

confidence: 99%

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Cryocooled 10 V Programmable Josephson Voltage Standard

Rüfenacht

Howe

Fox

et al. 2014

29th Conference on Precision Electromagnetic Measurements (CPEM 2014)

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Improvements in fabrication and packaging of our 10 V Programmable Josephson Voltage Standard circuits have enabled the successful operation of these devices on a cryocooler. Limited cooling power and temperature oscillations at the chip must not compromise the accuracy of the quantized voltage steps. Flat-spot measurements of quantized voltages produced with all of the sub-arrays when the chip is biased at a temperature of 4.35 K produced a step width of 0.78 mA. This result was obtained with a cryostat that uses a modest 1.3 kW aircooled compressor that generates 180 mW of cooling power at the chip 1 .

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“…A major breakthrough in Josephson technology was achieved with the development of the 10 V programmable Josephson junction array in 2010 by a group of scientists at NIST, Boulder [1]. The major difference between the programmable JVS (PJVS) and the conventional JVS is the biasing method.…”

Section: Introductionmentioning

confidence: 99%

10 V programmable Josephson voltage standard and its application in direct comparison with conventional Josephson voltage standard

Tang

Sims

2014

29th Conference on Precision Electromagnetic Measurements (CPEM 2014)

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1 -This paper briefly describes the working principle of the 10 V programmable Josephson voltage standard (PJVS) that was developed at the National Institute of Standards and Technology (NIST) and how to use it in a direct comparison with a conventional Josephson voltage standard (JVS). Manual and automatic comparison methods were investigated to verify the agreement between the two types of Josephson standards. The 10 V PJVS will be used as a transfer standard in the 2014 JVS Interlaboratory Comparison (ILC) that is organized by the National Conference of Standard Laboratories International (NCSLI). Index Terms -automatic comparison, conventional Josephson voltage standard, programmable Josephson voltage standard, uncertainty.

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NIST 10 V Programmable Josephson Voltage Standard System

Cited by 86 publications

References 21 publications

Development of zener calibration system using 10 V programmable Josephson voltage standard at NMIJ

Development of zener calibration system using 10 V programmable Josephson voltage standard at NMIJ

Cryocooled 10 V Programmable Josephson Voltage Standard

10 V programmable Josephson voltage standard and its application in direct comparison with conventional Josephson voltage standard

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