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Search Publications by: Samuel P. Benz (Fed)

Displaying 251 - 275 of 557

Microwave Optimization of 10 V PJVS Circuits

June 13, 2010

Author(s)

Paul D. Dresselhaus, Mike Elsbury, Charles J. Burroughs, Samuel P. Benz

Proper operation of programmable Josephson voltage standard arrays depends on the uniform distribution of microwaves to a large number of Josephson junctions. Too much or too little microwave power will change the current range of a junction s constant

Reduced Nonlinearities in the NIST Johnson Noise Thermometry System

June 13, 2010

Author(s)

Jifeng Qu, Samuel Benz, Alessio Pollarolo, Horst Rogalla

Improved electronics and synthesized noise waveforms for the NIST quantum-voltage-standard- calibrated Johnson noise thermometer (JNT) have lead to reduced uncertainty in the temperature measurement. Recent measurements show that some of the distortion in

Synthesizing Accurate Voltages with Superconducting Quantum-Based Standards

June 1, 2010

Author(s)

Samuel P. Benz

Over the past three decades, the quantum behavior of superconducting Josephson junctions were exploited to dramatically improve the accuracy of dc voltage measurements. Within the past couple years, new superconducting devices, circuits, systems and

Digital Circuits Using Self-Shunted Nb/NbxSi1-x/Nb Josephson Junctions

May 27, 2010

Author(s)

David I. Olaya, Paul Dresselhaus, Samuel Benz, Anna Herr, Quentin Herr, alex Ioannidis, Donald Miller, Alan Kleinsasser

For the first time superconducting digital circuits based on novel Josephson junctions with amorphous niobium-silicon (a-NbSi) barriers were designed, fabricated and tested. Compared with the resistively shunted aluminum-oxide-barrier junctions that are

Niobium-silicide junction technology for superconducting digital electronics

April 1, 2010

Author(s)

David I. Olaya, Paul D. Dresselhaus, Samuel P. Benz

We present a technology based on Nb/NbxSi1-x/Nb junctions, with barriers near the metal-insulator transition, for applications in superconducting electronics (SCE) as an alternative to Nb/AlOx/Nb tunnel junctions. Josephson junctions with co-sputtered

Electronic Measurement of the Boltzmann Constant with a Quantum-Voltage-Calibrated Johnson-Noise Thermometer

November 22, 2009

Author(s)

Samuel P. Benz, D. R. White, Jifeng Qu, Horst Rogalla, Weston L. Tew

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 compares Johnson

A 10 Volt Turnkey Programmable Josephson Voltage Standard for DC and Stepwise-Approximated Waveforms

September 1, 2009

Author(s)

Charles J. Burroughs, Alain Rufenacht, Paul Dresselhaus, Samuel Benz, Mike Elsbury

The output voltage of Programmable Josephson Voltage Standard (PJVS) circuits has reached the 10 V benchmark, which was set over twenty years ago by conventional dc Josephson Voltage Standard (JVS) systems. The nonhysteretic Josephson junctions in these

Broadband lumped-element integrated n-way power dividers for programmable Josephson voltage standards

August 12, 2009

Author(s)

Mike Elsbury, Paul D. Dresselhaus, Norman F. Bergren, Charles J. Burroughs, Samuel P. Benz, Zoya Popovic

This paper presents a monolithically integrated broadband lumped-element Wilkinson power divider centered at 20 GHz, which was designed and fabricated to uniformly distribute power to arrays of Josephson junctions (JJs) for superconducting voltage

Reduced Nonlinearities and Improved Temperature Measurements for the NIST Johnson Noise Thermometer

July 31, 2009

Author(s)

Jifeng Qu, Samuel Benz, Horst Rogalla, David R. White

The variance of temperature measurements made with the NIST Johnson noise thermometer has been reduced by use of improved cross-correlation electronics and a unique method for measuring and reducing nonlinearities. The spectral response of the voltage

A 10 Volt 'Turn-Key' Programmable Josephson Voltage Standard for DC and Stepwise-Approximated Waveforms

July 26, 2009

Author(s)

Charles J. Burroughs, Alain Rufenacht, Paul D. Dresselhaus, Samuel P. Benz, Mike Elsbury

Arrays with double-stacked NbxSi1-x-Barrier Junctions for Use in Programmable Josephson Voltage Standards driven at 70 GHz

June 16, 2009

Author(s)

Franz Mueller, Ralf Behr, R. Wendisch, Johannes Kohlmann, Paul Dresselhaus, Samuel Benz

Double-stacked Nb junctions with NbxSi1-x barriers were inserted into previously successfully tested 1 V and 10 V designs for Programmable Josephson voltage standards (PJVSs) with bias frequency near 70 GHz. Despite non-optimum targeting of the junction

Versatile co-sputtered Nb/NbxSi1-x/Nb Josephson junctions for Josephson voltage standards and high-speed superconducting digital electronics

June 16, 2009

Author(s)

David I. Olaya, Paul Dresselhaus, Samuel Benz

Josephson junctions that use co-sputtered amorphous Nb-Si barriers can be made with a wide variety of electrical properties depending on both the thickness of the barrier and its ratio of Nb to Si. Critical current density (Jc), specific capacitance (Cs)

Niobium-silicide Junction technology for superconducting digital electronics

June 15, 2009

Author(s)

David I. Olaya, Paul D. Dresselhaus, Samuel P. Benz

Digital superconducting electronics (SCE), which allows for very low power consumption and fast switching speeds, are a promising technology to deliver ultra-high performance computation. Currently, the preferred technology for junctions in SCE consists of