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Topic Area: Quantum Electrical Measurements

Displaying records 51 to 60 of 303 records.
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51. 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

52. 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

53. 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

54. 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

55. 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

56. 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

57. Design of a Turn-Key 10 V Programmable Josephson Voltage Standard System
Topic: Quantum Electrical Measurements
Published: 6/13/2008
Authors: Paul David Dresselhaus, Mike Elsbury, Charles J Burroughs, David Inocencio Olaya, Samuel Paul Benz, Norman F Bergren, Robert E Schwall, Zoya Popovic
Abstract: NIST is designing a 10 V Programmable Josephson Voltage Standard (PJVS) system with an improved microwave design and arrays of stacked NbXSi1-x-barrier Josephson junctions. For this new design a ?ground-up? approach, was used which takes into account ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32922

58. 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

59. Precision Differential Sampling Measurements of Low-Frequency Voltages Synthesized with an AC Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 6/9/2008
Authors: Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz, Paul David Dresselhaus, Bryan C Waltrip, Thomas L Nelson
Abstract: Sampling is a promising technique to compare the stepwise-approximated sine waves synthesized by an AC Programmable Josephson Voltage Standard to the sinusoidal voltages of a secondary source at low frequencies (a few hundred Hz or less). This paper ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32900

60. Progress toward a 1V Pulse-Driven AC Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 6/9/2008
Authors: Samuel Paul Benz, Paul David Dresselhaus, Norman F Bergren, Regis Landim
Abstract: We present a new record output voltage of 275 mVrms, which is a 25% improvement over the maximum achieved with previous ac Josephson voltage standard circuits. We demonstrate operating margins for these circuits and use them to measure the harmonic d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32869



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