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Topic Area: Quantum Electrical Measurements

Displaying records 61 to 70 of 300 records.
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61. Development of a 60 Hz Power Standard using SNS Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 4/7/2008
Authors: Charles J Burroughs, Samuel Paul Benz, Paul David Dresselhaus, Yonuk Chong, Bryan C Waltrip, Thomas L Nelson, J. Williams, D. Henderson, P. Patel, Luis Palafox, Ralf Behr
Abstract: We are implementing a new standard for 60 Hz power based on precision sinusoidal reference voltages from two independent Programmable Josephson Voltage Standards (PJVS) (one for voltage and one for current). The NIST PJVS systems use series arrays of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32393

62. Demonstration of a quantum controlled-NOT gate in the telecom band
Topic: Quantum Electrical Measurements
Published: 4/4/2008
Authors: Jun Chen, Joseph B Altepeter, Milja Medic, Fook Lee Kim, Burc Gokden, Robert Hadfield, Sae Woo Nam, Prem Kumar
Abstract: We present the first quantum controlled-NOT (CNOT) gate realized using a fiber-based indistinguishable photon-pair source in the 1.55 {mu}m telecommunications band. Using this free-space CNOT gate, all four Bell states are produced and fully characte ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33005

63. AC-DC Transfer Standard Measurements and Generalized Compensation with the AC Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 4/1/2008
Authors: Oliver F kieler, Regis Landim, Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs
Abstract: This paper presents ac-dc transfer standard measurements using the NIST pulse-driven ac Josephson voltage standard source. We have investigated the frequency dependence for several output voltages up to 200 mV for frequencies from 2.5 kHz to 100 kHz. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32616

64. Large array of multiplexed gamma-ray microcalorimeters for nuclear-materials analysis
Topic: Quantum Electrical Measurements
Published: 1/24/2008
Authors: William Bertrand Doriese, Joel Nathan Ullom, James A Beall, William Duncan, S. Lisa Ferreira, Gene C Hilton, Robert Daniel Horansky, Kent D Irwin, John A B Mates, Carl D Reintsema, Daniel Richard Schmidt, Leila R Vale, Yizi Xu, Barry L. Zink, Michael W Rabin, Minesh K Bacrania, Stephen Lamont, Andrew Hoover, Clifford R Rudy, Duc Vo, C. K. Stahle, Kevin R Boyce, Larry E Brown, Jonathan M King, F. S. Porter
Abstract: We are developing a gamma-ray spectrometer for the analysis of nuclear materials based on an array of superconducting transition-edge-sensor microcalorimeters. The instrument includes eight columns of time-division-SQUID multiplexing circuitry capabl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32765

65. Performance of a Cryocooled Nb DC Programmable Voltage Standard at 4 K
Topic: Quantum Electrical Measurements
Published: 12/3/2007
Authors: Robert J Webber, Charles J Burroughs, Masoud Radparvar
Abstract: We report on the performance of a 1 Volt DC programmable Josephson voltage standard (PJVS) operating on a commercially available Gifford-McMahon (G-M) cryocooler at 4 K. The NIST-fabricated niobium superconductor-normal metal-superconductor (SNS) jun ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32288

66. Uncertainty budget for the NIST Electron Counting Capacitance Standard, ECCS- 1
Topic: Quantum Electrical Measurements
Published: 11/21/2007
Authors: Mark W Keller, Neil M Zimmerman, Ali L Eichenberger
Abstract: We measure a cryogenic, vacuum-gap capacitor by two methods: 1) charging it with a known number of electrons and measuring the resulting voltage, and 2) using a capacitance bridge traceable to the SI farad. We report a detailed uncertainty budget for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32798

67. ACJVS Operating Margins using a Ternary Arbitrary Bitstream Generator
Topic: Quantum Electrical Measurements
Published: 6/22/2007
Authors: Ernest Houtzager, Samuel Paul Benz, Helko vanden Brom
Abstract: In this paper we present measurements with a pulse-driven AC Josephson voltage standard (ACJVS) that uses a ternary arbitrary bitstream generator as the bias source. From these measurements we conclude that the circuit is operational for voltages up ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32868

68. Systematic Error Analysis of Stepwise Approximated AC Waveforms Generated by a Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 6/22/2007
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: We have measured stepwise-approximated sinewaves generated by a Programmable Josephson Voltage Standard with several different output configurations. These data are analyzed to characterize the dominant error mechanisms for rms applications, such as ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32893

69. Design of SNS Josephson Arrays for High Voltage Applications
Topic: Quantum Electrical Measurements
Published: 6/4/2007
Authors: Paul David Dresselhaus, Samuel Paul Benz, Charles J Burroughs, Norman F Bergren, Yonuk Chong
Abstract: The voltage from a single, microwave-biased Josephson junction is a small quantity; thus useful voltages are only generated through series arrays of many thousands of junctions. Arrays of superconductor-normal metal-superconductor junctions have been ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32455

70. Precision Measurements using a 300 mV Josephson Arbitrary Waveform Synthesizer
Topic: Quantum Electrical Measurements
Published: 6/4/2007
Authors: Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs, Norman F Bergren
Abstract: We have developed a Josephson Digital-to-Analog Converter, otherwise know as a Josephson Arbitrary Waveform Synthesizer, with 300 mV peak output voltage. This is the first system of its kind with demonstrated quantum accuracy. We will show precision ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32454



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