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Topic Area: Quantum Electrical Measurements

Displaying records 21 to 30 of 302 records.
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21. Multitone Waveform Synthesis with a Quantum Voltage Noise Source
Topic: Quantum Electrical Measurements
Published: 11/9/2010
Authors: Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs
Abstract: We have developed a quantum voltage noise source (QVNS) based on pulse-driven Josephson arrays and optimized its waveform synthesis for use with Johnson noise thermometry (JNT). The QVNS synthesizes multitone waveforms with equal amplitude harmonic t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906298

22. 10 Volt Programmable Josephson voltage standard circuits using NbSi-barrier junctions
Topic: Quantum Electrical Measurements
Published: 10/28/2010
Authors: Paul David Dresselhaus, Mike Elsbury, David Olaya, Charles J Burroughs, Samuel Paul Benz
Abstract: Programmable Josephson voltage standard (PJVS) circuits were developed that operate at 16 GHz to 20 GHz with operating margins larger than 1 mA. Two circuit designs were demonstrated each having a total of ~ 300,000 junctions, which were divided into ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906299

23. Design of the NIST 10 V programmable Josephson voltage standard system
Topic: Quantum Electrical Measurements
Published: 6/13/2010
Authors: Charles J Burroughs, Paul David Dresselhaus, Alain Rufenacht, Mike Elsbury, Samuel Paul Benz
Abstract: NIST has developed and implemented a new Programmable Josephson Voltage Standard (PJVS) that operates at 10 V. This next-generation system is optimized for both dc metrology and stepwise-approximated ac voltage measurements for frequencies up to a f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904936

24. Development and investigation of intrinsically shunted junction series arrays for ac Josephson voltage standards
Topic: Quantum Electrical Measurements
Published: 6/13/2010
Authors: Johannes Kohlmann, Franz Mueller, Oliver F kieler, D. Schleussner, B Egeling, Ralf Behr, David Olaya, Paul David Dresselhaus, Samuel Paul Benz
Abstract: Different types of intrinsically shunted Josephson junctions have been developed and inves¬tigated for ac voltage standard applications at PTB. The first type for generation of voltages up to 10 V is driven by a 70 GHz sinusoidal microwave signal an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904858

25. Development of a Four-channel System for Johnson Noise Thermometry
Topic: Quantum Electrical Measurements
Published: 6/13/2010
Authors: Alessio Pollarolo, Jifeng Qu, Horst Rogalla, Paul David Dresselhaus, Samuel Paul Benz
Abstract: Long integration time is necessary to reach low uncertainty when measuring temperature through Johnson Noise Thermometry (JNT). The main goal of the NIST JNT experiment is to achieve a 6 10-6 relative uncertainty in the measurement of the water tripl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904968

26. Establishing an ac Josephson voltage standard at NRC
Topic: Quantum Electrical Measurements
Published: 6/13/2010
Authors: Piotr S. Filipski, M. Boecker, Samuel Paul Benz, Charles J Burroughs
Abstract: NRC recently established an AC Josephson Voltage Standard (ACJVS) system based on a NIST pulse-driven Josephson-junction array. This paper describes the efforts undertaken at NRC and the experience that was gained. An experimental method of measuring ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904857

27. Reduced Nonlinearities in the NIST Johnson Noise Thermometry System
Topic: Quantum Electrical Measurements
Published: 6/13/2010
Authors: Jifeng Qu, Samuel Paul Benz, Alessio Pollarolo, Horst Rogalla
Abstract: Improved electronics and synthesized noise waveforms for the NIST quantum-voltage-standard- calibrated Johnson noise thermometer (JNT) have lead to reduced uncertainty in the temperature measurement. Recent measurements show that some of the distorti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904874

28. Synthesizing Accurate Voltages with Superconducting Quantum-Based Standards
Topic: Quantum Electrical Measurements
Published: 6/1/2010
Author: Samuel Paul Benz
Abstract: Over the past three decades, the quantum behavior of superconducting Josephson junctions were exploited to dramatically improve the accuracy of dc voltage measurements. Within the past couple years, new superconducting devices, circuits, systems and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905041

29. Electronic Measurement of the Boltzmann Constant with a Quantum-Voltage-Calibrated Johnson-Noise Thermometer
Topic: Quantum Electrical Measurements
Published: 11/22/2009
Authors: Samuel Paul Benz, D. R White, Jifeng Qu, Horst Rogalla, Weston Leo Tew
Abstract: Currently, the CODATA value of the Boltzmann constant is dominated by a single gas-based-thermometry measurement with a relative uncertainty of 1.8 ձ0^-6. This paper describes an electronic approach to measuring the Boltzmann constant that comp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901450

30. Comparison of the INMETRO and NIST Josephson Voltage Standards (part of the ongoing regional key comparison SIM.EM.BIPM-K10.b1)
Topic: Quantum Electrical Measurements
Published: 10/10/2009
Authors: Yi-hua Tang, Regis Pinheiro Landim, Afonso Edson, Victor Ferreira
Abstract: A direct comparison of the 10 V Josephson Voltage Standards (JVS) of the National Institute of Standards and Technology (NIST), USA and the National Institute of Metrology, Standardization and Industrial Quality (INMETRO), Brazil was made in June 200 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903758



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