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Search Publications

NIST Authors in Bold

Displaying 151 - 175 of 425

Advanced ACTPol Multichroic Polarimeter Array Fabrication Process for 150 mm Wafers

July 22, 2015
Author(s)
Shannon M. Duff, Gene C. Hilton, Johannes Hubmayr, James A. Beall, Jason E. Austermann, Daniel T. Becker, Jeffrey L. Van Lanen
Advanced ACTPol is a third generation cosmic microwave background (CMB) receiver, deploying in 2016 on the Atacama Cosmology Telescope (ACT) in the Atacama desert of Chile. Spanning five frequency bands from 25 – 280 GHz and having a total of nearly 5800

A near-infrared 64-pixel superconducting nanowire single photon detector array with integrated multiplexed readout

May 14, 2015
Author(s)
Michael S. Allman, Varun B. Verma, Martin J. Stevens, Thomas Gerrits, Robert D. Horansky, Adriana E. Lita, Francesco Marsili, A. Beyer, Matthew Shaw, D. Kumor, Richard P. Mirin, Sae Woo Nam
We demonstrate a 64-pixel free-space-coupled array of superconducting nanowire single photon detectors optimized for high detection efficiency in the near-infrared range. An integrated, readily scalable, multiplexed readout scheme is employed to reduce the

Graph-based analysis of nonreciprocity in coupled-mode systems

February 10, 2015
Author(s)
Leonardo M. Ranzani, Jose A. Aumentado
In this work we derive the general conditions for obtaining nonreciprocity in multi-mode parametrically- coupled systems. The results can be applied to a broad variety of optical, microwave, and hybrid systems including recent electro- and opto-mechanical

Spin-transfer torque switching observed in nanopillar superconducting-magnetic hybrid Josephson junctions

January 9, 2015
Author(s)
Burm Baek, William H. Rippard, Matthew R. Pufall, Samuel P. Benz, Stephen E. Russek, Horst Rogalla, Paul D. Dresselhaus
Combining superconducting and magnetic materials to create novel superconducting devices has been motivated by the discovery of the Josephson critical current (Ics) oscillations with magnetic layer thickness and the demonstration of devices with switchable

Cryocooled 10 V Programmable Josephson Voltage Standard

December 11, 2014
Author(s)
Alain Rufenacht, Logan A. Howe, Anna Fox, Robert E. Schwall, Paul Dresselhaus, Charles J. Burroughs, Samuel Benz
Implementation of programmable Josephson voltage standard (PJVS) circuits on cryocooler at 4 K is a challenge. The limited cooling power of the cryocoolers has to balance the heat dissipated by the PJVS circuit in order to maintain a stable temperature

Junction Yield Analysis for 10 V Programmable Josephson Voltage Standard Devices

December 5, 2014
Author(s)
Anna E. Fox, Paul D. Dresselhaus, Alain Rufenacht, Aric W. Sanders, Samuel P. Benz
Analysis of the Josephson junction yield in the National Institute of Standards and Technology 10 V Programmable Josephson Voltage Standard (PJVS) has been performed by fabricating and measuring over 25 million Nb/NbxSi1-x/Nb junctions. Using the 265,116

Performance Improvements for the NIST 1 V Josephson arbitrary waveform synthesizer

November 10, 2014
Author(s)
Samuel P. Benz, Steven B. Waltman, Anna E. Fox, Paul D. Dresselhaus, Alain Rufenacht, Logan A. Howe, Robert E. Schwall, Nathan E. Flowers-Jacobs
The performance of the NIST Josephson arbitrary waveform synthesizer has been improved such that it generates a root-mean-square (RMS) output voltage of 1 V with an operating current range greater than 2 mA. Our previous 1 V JAWS circuit achieved this same

NIST 10 V Programmable Josephson Voltage Standard System Using a Low Capacity Cryocooler

November 6, 2014
Author(s)
Logan A. Howe, Anna Fox, Alain Rufenacht, Charles J. Burroughs, Paul Dresselhaus, Samuel Benz, Robert E. Schwall
Rising costs of and difficulty in obtaining liquid helium in many areas of the world provides strong motivation for cryogen-free operation of superconducting devices such as NIST Programmable Josephson Voltage Standard (PJVS) systems. However, operation on

1 V Josephson arbitrary waveform synthesizer

September 17, 2014
Author(s)
Samuel P. Benz, Steven B. Waltman, Anna E. Fox, Paul D. Dresselhaus, Alain Rufenacht, Jason M. Underwood, Charles J. Burroughs
A quantum-accurate waveform with a root-mean-square (RMS) output amplitude of 1 V has been synthesized for the first time. This four-fold increase in voltage over previous systems was achieved through developments and improvements in bias electronics

Influence of the heat-treatment conditions, microchemistry, and microstructure on the irreversible strain limit of a selection of Ti-doped internal-tin Nb 3 Sn ITER wires

August 19, 2014
Author(s)
Najib Cheggour, Loren F. Goodrich, Z-H Sung, Theodore C. Stauffer, Jolene D. Splett, P. J. Lee, Matthew C. Jewell
Systematic studies of the intrinsic irreversible strain limit ε irr0, microstructure, and microchemistry were made on several internal-tin Nb 3Sn pre-production wires fabricated for the domestic agencies of the U.S.A. and China participating in the

Modulated Electromechanics: Large Enhancements of Nonlinearities

July 16, 2014
Author(s)
Raymond W. Simmonds, Jie-Qiao Liao, Kurt Jacobs, Franco Nori
It is well-known that the nonlinear coupling between a mechanical oscillator and a superconducting oscillator or optical cavity can be used to generate a Kerr-nonlinearity for the cavity mode. We show that the strength of this Kerr-nonlinearity, as well as

Hybrid superconducting-magnetic memory device using competing order parameters

May 28, 2014
Author(s)
Burm Baek, William H. Rippard, Samuel P. Benz, Stephen E. Russek, Paul D. Dresselhaus
The quantum behavior of Josephson junctions is often exploited to produce superconducting devices with outstanding performance. Josephson junctions can also be used in circuits that perform logic operations in picoseconds and may enable high-performance

Precision high-value resistance scaling with a two-terminal cryogenic current comparator

March 1, 2014
Author(s)
Randolph E. Elmquist, George R. Jones, Felipe L. Hernandez-Marquez, Marcos Bierzychudek
We describe a cryogenic two-terminal high-resistance bridge and its application in precision resistance scaling from the quantized Hall resistance (QHR) at RH = RK/2 = 12 906.4035 _ to decade resistance standards with values between 1 M_ and 1 G_. The

A four-pixel single-photon pulse-position array fabricated from WSi superconducting nanowire single- photon detectors

February 3, 2014
Author(s)
Varun B. Verma, Robert D. Horansky, Francesco Marsili, Jeffrey Stern, Matthew Shaw, Adriana E. Lita, Richard P. Mirin, Sae Woo Nam
We demonstrate a scalable readout scheme for an infrared single-photon pulse-position camera consisting of WSi superconducting nanowire single-photon detectors. For an N × N array, only 2 × N wires are required to obtain the position of a detection event

Phase-slip lines as a resistance mechanism in transition-edge sensors

January 27, 2014
Author(s)
Douglas A. Bennett, Daniel R. Schmidt, Daniel S. Swetz, Joel N. Ullom
The fundamental mechanism of resistance in voltage-biased superconducting films is poorly understood despite its importance as the basis of transition-edge sensors (TESs). TESs are utilized in state-of- the-art microbolometers and microcalorimeters

Johnson-noise thermometry based on a quantized-voltage noise source at NIST

September 11, 2013
Author(s)
Alessio Pollarolo, Tae H. Jeong, Samuel Benz, Paul Dresselhaus, Horst Rogalla, Weston L. Tew
Johnson Noise Thermometry is an electronic approach to measuring temperature. For several years, NIST has been developing a switching-correlator-type Johnson-noise thermometer that uses a quantized voltage noise source as an accurate voltage reference

Direct Comparison of two NIST PJVS systems at 10 V

August 27, 2013
Author(s)
Stephane Solve, Alain Rufenacht, Charles J. Burroughs, Samuel Benz
Two NIST Programmable Josephson Voltage Standard (PJVS) systems have been directly compared at 10V using different nanovoltmeters at the temperature of the laboratory. These PJVS systems use arrays double-stacked superconducting-niobium Josephson junctions

Broadband S-parameter characterization of a DC-SQUID amplifier

July 9, 2013
Author(s)
Leonardo M. Ranzani, Lafe F. Spietz, Jose A. Aumentado
In this work we characterize the 2-port scattering parameters of a superconducting quantum interference device (DC-SQUID) ampli er at 20 mK in the 2{8 GHz band. The measurement reference plane is positioned on a 6.25 microstrip line situated directly at

Flat Frequency Response in the Electronic Measurement of the Boltzmann Constant

June 1, 2013
Author(s)
Jifeng Qu, Horst Rogalla, Yang Fu, Jianqiang Zhang, Alessio Pollarolo, Samuel Benz
A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with an integration period

Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards

June 1, 2013
Author(s)
Charles J. Burroughs, Alain Rufenacht, Samuel Benz, Paul Dresselhaus
The amplitudes of stepwise-approximated sine waves generated by programmable Josephson voltage standards (PJVS) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a method

Two-port microwave calibration at millikelvin temperatures

March 15, 2013
Author(s)
Leonardo M. Ranzani, Jose A. Aumentado, Lafe F. Spietz, Zoya Popovic
In this work we introduce a system for 2-port microwave calibration at millikelvin temperatures operating at the coldest stage of a dilution refrigerator by use of an adapted thru-reflect-line algorithm. We show that this can be an effective tool for

Two-port microwave calibration at milliKelvin temperatures

March 5, 2013
Author(s)
Leonardo M. Ranzani, Lafe F. Spietz, Zoya Popovic, Jose A. Aumentado
In this work we introduce a system for 2-port microwave calibration at millikelvin temperatures operating at the coldest stage of a dilution refrigerator by use of an adapted thru-reflect-line algorithm. We show that this can be an effective tool for
Displaying 151 - 175 of 425