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Electronics

Superconducting electronics

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Displaying 201 - 225 of 445

Demonstration of code-division multiplexing for x-ray microcalorimeters

February 13, 2012
Author(s)
Greg Stiehl, W.Bertrand (Randy) Doriese, Gene C. Hilton, Kent D. Irwin, Carl D. Reintsema, Dan Schmidt, Daniel Swetz, Joel Ullom, Leila R. Vale, Joseph Fowler
We demonstrate the code-division multiplexing (CDM) readout of eight transition-edge sensor microcalorimeters. The energy resolution is 3.0 eV (full width at half-maximum) or better at 5.9 keV, with a best resolution of 2.3 eV and a mean of 2.6 eV over the

Advanced Code-Division Multiplexers for Superconducting Detector Arrays

February 11, 2012
Author(s)
Kent D. Irwin, Hsiao-Mei Cho, William B. Doriese, Joseph W. Fowler, Gene C. Hilton, Michael D. Niemack, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale
Multiplexers based on the modulation of superconducting quantum interference devices are now regularly used in multi-kilopixel arrays of superconducting detectors for astrophysics, cosmology, and materials analysis. Over the next decade, much larger arrays

Quantum-based Voltage Waveform Synthesis

November 11, 2011
Author(s)
Samuel P. Benz
More than a decade of research and development was required to practically exploit the quantum behavior of superconducting Josephson junctions for ac applications. Sine waves and arbitrary waveforms had to be synthesized with sufficiently large voltage

Electromechanical Characterization of Bi-2212 Strands

June 1, 2011
Author(s)
Xifeng Lu
The uniaxial strain dependence of the critical current was measured both in tension and compression in Bi-2212 high-temperature superconducting round wires. We observed that permanent damage to the critical current can easily occur due to strain. To

Practical Operation of Cryogen-free Programmable Josephson Voltage Standards

February 17, 2011
Author(s)
Robert E. Schwall, David Zilz, Jeffrey Power, Charles J. Burroughs, Paul D. Dresselhaus, Samuel P. Benz
Cryogen-free operation is rapidly becoming the preferred implementation of programmable Josephson voltage standard (PJVS) systems. There are strong operational incentives for using the smallest possible cryocooler in order to minimize acoustic noise

Design of the NIST 10V programmable Josephson voltage standard system

January 13, 2011
Author(s)
Charles J. Burroughs, Paul Dresselhaus, Alain Rufenacht, David I. Olaya, Mike Elsbury, Yi-hua D. Tang, Samuel Benz
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 few

Reduced Nonlinearity Effect on the Electronic Measurement of the Boltzmann Constant

January 10, 2011
Author(s)
Jifeng Qu, Samuel Benz, Alessio Pollarolo, Horst Rogalla
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 have

Development of a Four-channel System for Johnson Noise Thermometry

December 30, 2010
Author(s)
Alessio Pollarolo, Chiharu Urano, Paul Dresselhaus, Jifeng Qu, Horst Rogalla, Samuel Benz
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 triple

Superconducting multiplexer filter bank for a frequency-selective power limiter

December 23, 2010
Author(s)
Eduard Rocas, Alberto Padilla, Jordi Mateu, Juan C. Collado Gomez, James C. Booth, Juan M. O'Callaghan
This work proposes a superconducting multiplexer filter bank configuration to be used as a frequency-selective power limiter. The proposed configuration limits narrowband high power signals without degrading the signal performance in the remainder

10 Volt Programmable Josephson voltage standard circuits using NbSi-barrier junctions

October 28, 2010
Author(s)
Paul D. Dresselhaus, Mike Elsbury, David I. Olaya, Charles J. Burroughs, Samuel P. Benz
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

Measurement crosstalk between two phase qubits coupled by a coplanar waveguide

September 14, 2010
Author(s)
Fabio Altomare, Katarina Cicak, Mika A. Sillanpaa, Michael S. Allman, Dale Li, Adam J. Sirois, Joshua Strong, Jae Park, Jed D. Whittaker, Raymond W. Simmonds
We investigate measurement crosstalk in a system with two flux-biased phase qubits coupled by a resonant coplanar waveguide cavity. After qubit measurement, the superconducting phase undergoes damped oscillations in a deep anharmonic potential producing a

An Analytical Model for Pulse Shape and Electrothermal Stability in Two-Body Microcalorimeters

September 9, 2010
Author(s)
Douglas A. Bennett, Robert D. Horansky, Daniel R. Schmidt, Daniel S. Swetz, Leila R. Vale, Joel N. Ullom, Andrew Hoover, Michael W. Rabin, Nathan J. Hoteling
High resolution superconducting gamma-ray sensors show potential for the more accurate analysis of nuclear material. These devices are part of a larger class of microcalorimeters and bolometers based on transition edge sensors (TESs) that have two distinct

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

Code-division SQUID multiplexing

April 23, 2010
Author(s)
Michael D. Niemack, Kent D. Irwin, Joern Beyer, Hsiao-Mei Cho, William B. Doriese, Gene C. Hilton, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale
Multiplexed superconducting quantum interference device (SQUID) readout systems are a critical technology for measuring large arrays of superconducting transition-edge sensor (TES) detectors. Current successful SQUID multiplexing architectures 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

Low-loss superconducting resonant circuits using vacuum-gap -based microwave components

March 4, 2010
Author(s)
Katarina Cicak, Dale Li, Joshua Strong, Michael S. Allman, Fabio Altomare, Adam J. Sirois, Jed D. Whittaker, Raymond W. Simmonds
We have produced high quality resonant microwave circuits through developing a vacuum-gap technology for fabricating lumped-element capacitive and inductive components. We use micromachining to eliminate amorphous dielectric materials leaving vacuum in

Superconductor Science and Technology

February 22, 2010
Author(s)
Kent D. Irwin, Michael D. Niemack, Joern Beyer, Hsiao-Mei Cho, William B. Doriese, Gene C. Hilton, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale
Multiplexed superconducting quantum interference device (SQUID) amplifiers have recently enabled the deployment of kilopixel arrays of superconducting transition-edge sensor (TES) detectors on a variety of receivers for astrophysics. Existing multiplexing

Electronics for a Next-Generation SQUID-Based Time-Domain Multiplexing System

December 16, 2009
Author(s)
Carl D. Reintsema, Gene C. Hilton, Kent D. Irwin, Joseph S. Adams, Robert Baker, Simon R. Bandler, William B. Doriese, Enectali Figueroa-Feliciano, Richard L. Kelly, Caroline A. Kilbourne, F. S. Porter, Jeff Krinsky, Patrick Wikus
A decade has elapsed since the design, development and realization of a SQUID-based time-division multiplexer at NIST. During this time the system has been used extensively for low-temperature-detector-array measurements. Concurrently, there have been
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