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Topic Area: Quantum Electrical Measurements

Displaying records 41 to 50 of 296 records.
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41. Precision Differential Sampling Measurements of Low-Frequency Synthesized Sine Waves with an AC Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz, Paul David Dresselhaus, Bryan C Waltrip, Thomas L Nelson
Abstract: We have developed a precision technique to measure sine wave sources with the use of a quantum-accurate ac programmable Josephson voltage standard. This paper describes a differential method that uses an integrating sampling voltmeter to precisely de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33051

42. Progress toward a 1 V Pulse-Driven AC Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Samuel Paul Benz, Paul David Dresselhaus, Alain Rufenacht, Norman F Bergren, Joseph R Kinard, Regis Landim
Abstract: We present a new record rms output voltage of 275 mV, which is a 25 % improvement over the maximum achieved with previous ac Josephson voltage standard (ACJVS) circuits. We demonstrate operating margins for these circuits and use them to measure the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33061

43. Systematic Error Analysis of Stepwise Approximated AC Waveforms Generated by Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: We have measured stepwise-approximated sine waves generated by a Programmable Josephson Voltage Standard (PJVS) with several different output configurations. These data are analyzed to characterize the dominant error mechanisms for rms applications, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33063

44. EEEL Technical Accomplishments
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7568
Topic: Quantum Electrical Measurements
Published: 3/30/2009
Author: Erik M Secula
Abstract: This document describes the technical work of the Electronics and Electrical Engineering Laboratory. In this report, you will find that EEEL researchers are developing the world's most advanced sensors, providing advanced gamma ray imagers for astro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901701

45. Ultra-high resolution alpha particle spectroscopy using calorimetry
Topic: Quantum Electrical Measurements
Published: 9/23/2008
Authors: Robert Daniel Horansky, Joel Nathan Ullom, James A Beall, Gene C Hilton, Kent D Irwin, Don Dry, Beth Hastings, Stephen Lamont, Clifford R Rudy, Michael W Rabin
Abstract: Calorimetry has been used since the late 1700?s to measure the heat output of physical processes ranging from chemical reactions to the respiration of organisms . Calorimetry is performed by measuring the temperature change caused by heat release int ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32940

46. Phase Locking Transition in a Chirped Superconducting Josephson Resonator
Topic: Quantum Electrical Measurements
Published: 9/12/2008
Authors: Jose Alberto Aumentado, Ofer Naaman, L Friedland, J.S. Wurtele, Irfan Siddiqi
Abstract: We observe a sharp threshold for autoresonant phase locking in a transmission line resonator embedded with a Josephson tunnel junction and driven with a purely ac, chirped microwave signal. When the drive amplitude is below a critical value, the re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33039

47. Input Impedance and Gain of a Gigahertz Amplifer Using a DC SQUID in a Quarter Wave Resonator
Topic: Quantum Electrical Measurements
Published: 8/29/2008
Authors: Lafe F. Spietz, Kent D Irwin, Jose Alberto Aumentado
Abstract: Due to their superior noise performance, SQUIDs are an attractive alternative to high electron mobility transistors for constructing ultra low noise microwave amplifiers for cryogenic use. The primary problem to be overcome in designing such an amp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33066

48. Homodyne detection of optical cat states generated by squeezed light photon subtraction
Topic: Quantum Electrical Measurements
Published: 8/19/2008
Authors: Thomas Gerrits, Tracy S. Clement, Scott C Glancy, Sae Woo Nam, Richard P Mirin, Emanuel H Knill
Abstract: We have experimentally created and measured an optical Schrödinger Cat State. The method relies on single photon subtraction off a squeezed vacuum state and conditioning a homodyne measurement on the detection of that photon.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33008

49. Error and Transient Analysis of Stepwise-Approximated Sinewaves Generated by Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 7/1/2008
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus, Bryan C Waltrip, Thomas L Nelson
Abstract: We are developing a quantum-based 60 Hz power standard that exploits the precision sinusoidal reference voltages synthesized by programmable Josephson voltage standards (PJVS). PJVS technology was chosen for this application because we need to genera ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32663

50. Systematic-Error Signals in the AC Josephson Voltage Standard: Measurement and Reduction
Topic: Quantum Electrical Measurements
Published: 6/30/2008
Authors: Regis Landim, Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs
Abstract: We investigate the dominant frequency-dependent systematic error signals (SES) in the ac Josephson voltage standard. We describe our error measurement technique and a number of methods to reduce the errors. Most importantly we found that a small chan ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32671