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Topic Area: Quantum Electrical Measurements

Displaying records 11 to 20 of 300 records.
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11. 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

12. Johnson Noise Thermometry Measurement of the Boltzmann Constant with a 200 Ohm Sense Resistor
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Horst Rogalla
Abstract: In 2010 NIST measured the Boltzmann constant k by use of an electronic technique that measured the Johnson noise of a 100 Ohm resistor at the triple point of water (TPW). The NIST Johnson noise thermometry (JNT) system used as a reference a voltage ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910628

13. Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: The amplitudes of stepwise-approximated sine waves produced by programmable Josephson voltage standards (PJVSs) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910626

14. Quantum Calibration System for AC Measurement Standards using Inductive Voltage Dividers
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Thomas Hagen, Ilya Budovsky, Samuel Paul Benz, Charles J Burroughs
Abstract: A pulse driven ac Josephson voltage standard (ACJVS) has been set up at the National Measurement Institute, Australia (NMIA) with the help of the National Institute of Standards and Technology (NIST). The ACJVS forms the basis of a high precision cal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910579

15. An electronic measurement of the Boltzmann constant
Topic: Quantum Electrical Measurements
Published: 3/30/2011
Authors: Samuel Paul Benz, Alessio Pollarolo, Jifeng Qu, Horst Rogalla, Chiharu Urano, Weston Leo Tew, Paul David Dresselhaus, D. R White
Abstract: The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907640

16. Design of the NIST 10V programmable Josephson voltage standard system
Topic: Quantum Electrical Measurements
Published: 1/13/2011
Authors: Charles J Burroughs, Paul David Dresselhaus, Alain Rufenacht, David Olaya, Mike Elsbury, Yi-hua Tang, 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=905934

17. Reduced Nonlinearity Effect on the Electronic Measurement of the Boltzmann Constant
Topic: Quantum Electrical Measurements
Published: 1/10/2011
Authors: Jifeng Qu, Samuel Paul Benz, Alessio Pollarolo, Horst Rogalla
Abstract: NIST has developed a quantum voltage noise source (QVNS) calibrated Johnson noise thermometer (JNT) to provide a new electronic measurement technique for determining the Boltzmann constant. Improvements in electronics and synthesized noise waveforms ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905951

18. 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

19. 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

20. 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



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