Anna E. Fox
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View article: Design Ideas for Inpatient Stroke Rehabilitation Facilities: Living Lab Findings
Design Ideas for Inpatient Stroke Rehabilitation Facilities: Living Lab Findings Open
Objectives To provide actionable, co-designed ideas for how to optimize the built environment and service of inpatient stroke rehabilitation facilities. Background Input from diverse stakeholders is needed to ensure that stroke rehabilitat…
View article: AC metrology applications of the Josephson effect
AC metrology applications of the Josephson effect Open
The performance of programmable voltage signals that exploit the quantum behavior of superconducting Josephson junctions continues to improve and enhance measurements in metrology, communications, and quantum control. We review advances in…
View article: Direct implementation of a frequency-programmable Josephson voltage standard to provide an SI traceable optical power scale
Direct implementation of a frequency-programmable Josephson voltage standard to provide an SI traceable optical power scale Open
We have developed a technique to determine the electrical substitution power of a cryogenic optical radiant power detector, that directly implements a frequency-programmable Josephson voltage standard (FPJVS), thus reducing the traceabilit…
View article: Sub-GHz resolution line-by-line pulse shaper for driving superconducting circuits
Sub-GHz resolution line-by-line pulse shaper for driving superconducting circuits Open
We demonstrate a sub-GHz resolution, fully programmable Fourier-domain pulse shaper capable of generating arbitrary optical pulse patterns for superconducting circuit platforms. This high resolution allows line-by-line pulse shaping of a 1…
View article: Demonstration of Superconducting Optoelectronic Single-Photon Synapses
Demonstration of Superconducting Optoelectronic Single-Photon Synapses Open
Superconducting optoelectronic hardware is being explored as a path towards artificial spiking neural networks with unprecedented scales of complexity and computational ability. Such hardware combines integrated-photonic components for few…
View article: Awards
Awards Open
DESCRIPTION: To recognize the potential impact of superconductivity on the fields of electrical engineering, physics, medicine, and energy by rewarding young entrepreneurs who have established a successful business or had the primary respo…
View article: The Atacama Cosmology Telescope: arcminute-resolution maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data combined with Planck
The Atacama Cosmology Telescope: arcminute-resolution maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data combined with Planck Open
This paper presents a maximum-likelihood algorithm for combining sky maps with disparate sky coverage, angular resolution and spatially varying anisotropic noise into a single map of the sky. We use this to merge hundreds of individual map…
View article: Dual Josephson impedance bridge: towards a universal bridge for impedance metrology
Dual Josephson impedance bridge: towards a universal bridge for impedance metrology Open
This paper presents a full characterization of a Dual Josephson Impedance Bridge (DJIB) at frequencies up to 80 kHz by using the DJIB to compare the best available impedance standards that are (a) directly traceable to the quantum Hall eff…
View article: Josephson Microwave Sources Applied to Quantum Information Systems
Josephson Microwave Sources Applied to Quantum Information Systems Open
Quantum computers with thousands or millions of qubits will require a scalable solution for qubit control and readout electronics. Colocating these electronics at millikelvin temperatures has been proposed and demonstrated, but there exist…
View article: 1 GHz Waveform Synthesis With Josephson Junction Arrays
1 GHz Waveform Synthesis With Josephson Junction Arrays Open
We synthesize single- and multiple-tone waveforms at gigahertz frequencies from arrays of Josephson junctions and demonstrate their quantum-locked operation over a range of experimental input parameters. We first use a lumped-element circu…
View article: Quantized Pulse Propagation in Josephson Junction Arrays
Quantized Pulse Propagation in Josephson Junction Arrays Open
We present time-domain electrical measurements and simulations of the quantized voltage pulses that are generated from series-connected Josephson junction (JJ) arrays. The transmission delay of the JJ array can lead to a broadening of the …
View article: Characterization of Uniformity in Nb/Nb<sub>x</sub>Si<sub>1-x</sub>/Nb Josephson Junctions
Characterization of Uniformity in Nb/Nb<sub>x</sub>Si<sub>1-x</sub>/Nb Josephson Junctions Open
The uniformity of the barriers in Josephson junctions (JJs) is a critical parameter in determining performance and operating margins for a wide variety of superconducting electronic circuits. We present an automated measurement system capa…
View article: The NIST Johnson Noise Thermometry System for the Determination of the Boltzmann Constant
The NIST Johnson Noise Thermometry System for the Determination of the Boltzmann Constant Open
In preparation for the redefinition of the International System of Units (SI), five different electronic measurements of the Boltzmann constant have been performed using different Johnson noise thermometry (JNT) systems over the past seven…
View article: A Boltzmann constant determination based on Johnson noise thermometry
A Boltzmann constant determination based on Johnson noise thermometry Open
A value for the Boltzmann constant was measured electronically using an improved version of the Johnson Noise Thermometry (JNT) system at the National Institute of Standards and Technology (NIST), USA. This system is different from prior o…
View article: Detection of the pairwise kinematic Sunyaev-Zel'dovich effect with BOSS DR11 and the Atacama Cosmology Telescope
Detection of the pairwise kinematic Sunyaev-Zel'dovich effect with BOSS DR11 and the Atacama Cosmology Telescope Open
We present a new measurement of the kinematic Sunyaev-Zel'dovich effect using data from the Atacama Cosmology Telescope (ACT) and the Baryon Oscillation Spectroscopic Survey (BOSS). Using 600 square degrees of overlapping sky area, we eval…
View article: Josephson Arbitrary Waveform Synthesis With Multilevel Pulse Biasing
Josephson Arbitrary Waveform Synthesis With Multilevel Pulse Biasing Open
We describe the implementation of new commercial pulse-bias electronics that have enabled an improvement in the generation of quantum-accurate waveforms both with and without low-frequency compensation biases. We have used these electronic…
View article: Direct comparison of a pulse-driven Josephson arbitrary waveform synthesizer and a programmable Josephson voltage standard at 1 volt
Direct comparison of a pulse-driven Josephson arbitrary waveform synthesizer and a programmable Josephson voltage standard at 1 volt Open
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View article: 2 Volt pulse-driven josephson arbitrary waveform synthesizer
2 Volt pulse-driven josephson arbitrary waveform synthesizer Open
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View article: 10 Volt automated direct comparison of two cryocooled programmable Josephson voltage standards
10 Volt automated direct comparison of two cryocooled programmable Josephson voltage standards Open
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View article: Improved spectral aberration in Johnson Noise Thermometry
Improved spectral aberration in Johnson Noise Thermometry Open
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View article: Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers
Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers Open
The root-mean-square (rms) output voltage of the NIST Josephson arbitrary waveform synthesizer (JAWS) has been doubled from 1 V to a record 2 V by combining two new 1 V chips on a cryocooler. This higher voltage will improve calibrations o…