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Displaying records 11 to 20 of 35 records.
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11. 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

12. Development of a Four-channel System for Johnson Noise Thermometry
Topic: Quantum Electrical Measurements
Published: 12/30/2010
Authors: Alessio Pollarolo, Chiharu Urano, Paul David Dresselhaus, Jifeng Qu, Horst Rogalla, 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=905961

13. Development of a Quantum-Voltage-Calibrated Noise Thermometer at NIM
Topic: Quantum Electrical Measurements
Published: 9/11/2013
Authors: Jifeng Qu, Samuel Paul Benz, Jianqiang Zhang, Horst Rogalla, Yang Fu, Alessio Pollarolo, Jintao Zhang
Abstract: A quantum-voltage-calibrated Johnson-noise thermometer was developed at NIM, which measures the Boltzmann constant k through comparing the thermal noise across a 100  sense resistor at the temperature of the triple point water to the comb-lik ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910779

14. Differential Sampling Measurement of a 7 V rms Sine Wave and a Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz, Paul David Dresselhaus
Abstract: A 10 V programmable Josephson voltage standard has enabled sine waves with rms voltages up to 7 V to be accurately measured with differential sampling methods. This paper reviews the challenges and limitations of differential sampling that arise when ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910561

15. Differential sampling measurement of a 7 V rms Sine Wave with a Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Alain Rufenacht, Charles J Burroughs, Paul David Dresselhaus, Samuel Paul Benz
Abstract: A 10 V programmable Josephson voltage standard has enabled sine waves with voltages up to 7 V rms to be accurately measured with a differential sampling measurement technique. Expanding the voltage range for this technique enables direct calibration ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911610

16. Direct Comparison of two NIST PJVS systems at 10 V
Topic: Quantum Electrical Measurements
Published: 8/27/2013
Authors: Stephane Solve, Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz
Abstract: Two NIST Programmable Josephson Voltage Standard (PJVS) systems have been directly compared at 10V using different nanovoltmeters at the temperature of the laboratory. These PJVS systems use arrays double-stacked superconducting-niobium Josephson ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913689

17. 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

18. Flat Frequency Response in the Electronic Measurement of the Boltzmann Constant
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Jifeng Qu, Horst Rogalla, Yang Fu, Jianqiang Zhang, Alessio Pollarolo, Samuel Paul Benz
Abstract: A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with an integration p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911739

19. Flat frequency response in the electronic measurement of the Boltzmann constant
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Jifeng Qu, Samuel Paul Benz, Yang Fu, Jianqiang Zhang, Horst Rogalla, Alessio Pollarolo
Abstract: A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with integration peri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910580

20. Improvements in the NIST Johnson Noise Thermometry System
Topic: Quantum Electrical Measurements
Published: 6/9/2008
Authors: Samuel Paul Benz, Horst Rogalla, Rod White, Jifeng Qu, Paul David Dresselhaus, Wes L Tew, Sae Woo Nam
Abstract: We have developed a Johnson noise thermometry system that is calibrated by precision waveforms synthesized with a quantum-accurate voltage noise source (QVNS). Significant improvements to the QVNS and the cross-correlation measurement electronics hav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32883



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