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A stochastic SPICE model for superconducting nanowire single photon detectors and other nanowire devices

January 10, 2019

Author(s)

Adam N. McCaughan, Sae Woo Nam, Dylan M. Oh

Superconducting nanowire devices such as the superconducting nanowire single photon detector (SNSPD) or nanocryotron (nTron) have a time-dependent stochasticity associated with them which depends on the current flowing through them. When modeling complex

Possible hundredfold enhancement in the direct magnetic coupling of a single-atom electron spin to a circuit resonator

January 2, 2019

Author(s)

Bahman Sarabi, Peihao Huang, Neil M. Zimmerman

We report on the challenges and limitations of direct coupling of the magnetic eld from a circuit resonator to an electron spin bound to a donor potential. We propose a device consisting of a lumped-element superconducting resonator and a single donor

Uncertainty analysis for ac-dc difference measurements with the AC Josephson Voltage Standard

December 21, 2018

Author(s)

Jason M. Underwood

A detailed analysis of the uncertainties encountered in ac-dc difference measurements with an AC Josephson Voltage Standard (ACJVS) is presented. While the discussion is focused primarily on ac-dc difference, the results may be applied to other ac voltage

AC Voltage Measurements to 120 V with a Josephson Arbitrary Waveform Synthesizer and an Inductive Voltage Divider

December 17, 2018

Author(s)

Dimitrios Georgakopoulos, Ilya F. Budovsky, Samuel Benz

We have developed a system to extend, by a factor of up to 1000, the voltage range over which Josephson arbitrary waveform synthesizers (JAWS) can be used in ac voltage metrology. The system is based on a precision inductive voltage divider, with a lock-in

Josephson Arbitrary Waveform Synthesizer as a Reference Standard for the Measurement of the Phase of Harmonics in Distorted Waveforms

November 14, 2018

Author(s)

Dimitrios Georgakopoulos, Ilya F. Budovsky, Samuel Benz, G. Gubler

We have used the Josephson arbitrary waveform synthesizer (JAWS) to provide traceability for the phase of the harmonics, relative to its fundamental, of a distorted waveform. For distorted waveforms with rms values from 0.154 V to 0.2 V and harmonic

Energy efficient single flux quantum based neuromorphic computing

November 8, 2018

Author(s)

Michael Schneider, Christine A. Donnelly, Stephen E. Russek, Burm Baek, Matthew Pufall, Pete Hopkins, William Rippard

Many neuromorphic hardware technologies are being explored for their potential to increase the efficiency of computing certain problems, and thus facilitate machine learning with greater energy efficiency and or with more complexity. Among the technologies

Tile-and-trim micro-resonator array fabrication optimized for high multiplexing factors

November 8, 2018

Author(s)

Christopher M. McKenney, Jason E. Austermann, James A. Beall, Bradley J. Dober, Shannon M. Duff, Jiansong Gao, Gene C. Hilton, Johannes Hubmayr, Dale Li, Joel N. Ullom, Jeffrey L. Van Lanen, Michael R. Vissers

We present a superconducting micro-resonator array fabrication method that is scalable and reconfigurable and has been optimized for high multiplexing factors. The method uses uniformly sized tiles patterned on stepper photolithography reticles as the

Jitter Sensitivity Analysis of the Superconducting Josephson Arbitrary Waveform Synthesizer

November 4, 2018

Author(s)

Christine A. Donnelly, Justus Brevik, Paul Dresselhaus, Pete Hopkins, Samuel P. Benz

We present the first jitter sensitivity analysis of a superconducting voltage reference waveform synthesizer with fundamentally accurate output pulses. Successful deployment of a reference waveform source at microwave frequencies will represent a new

Impact of the New Generation of Josephson Voltage Standards in ac and dc Electric Metrology

August 24, 2018

Author(s)

Alain Rufenacht, Nathan E. Flowers-Jacobs, Samuel P. Benz

For decades, the quantum behavior of Josephson junctions has been developed and employed as intrinsic standards for voltage metrology. Conventional dc Josephson voltage standards have been the primary standards for voltage, programmable Josephson voltage

Readout architectures for superconducting nanowire single photon detectors

August 16, 2018

Author(s)

Adam N. McCaughan

Advances in the development of superconducting nanowire single photon detectors (SNSPD) have guaranteed that they remain a leading photon detection technology in applications such as quantum information, low-power optical communications, and the life

A 300-mK Test Bed for Rapid Characterization of Microwave SQUID Multiplexing Circuits

August 3, 2018

Author(s)

Abigail L. Wessels, Daniel T. Becker, Douglas A. Bennett, Johnathon D. Gard, Johannes Hubmayr, Norman Jarosik, Vincent Y. Kotsubo, John A. Mates, Joel N. Ullom

Microwave SQUID multiplexing is a promising technique for multiplexing large arrays of transition edge sensors. A major bottleneck in the development and distribution of microwave SQUID multiplexer chips occurs in the time-intensive design testing and

Hot science with cool sensors

August 1, 2018

Author(s)

Kelsey M. Morgan

A thin superconducting film in the transition between its superconducting and normal states makes an ultra-sensitive thermometer, capable of measuring the energy of individual x-ray and gamma ray photons. The transition edge sensor, like the

A Scalable Readout for Microwave SQUID Multiplexing of Transition-Edge Sensors

July 9, 2018

Author(s)

Johnathon D. Gard, Daniel T. Becker, Douglas A. Bennett, Joseph W. Fowler, Gene C. Hilton, John A. Mates, Carl D. Reintsema, Daniel R. Schmidt, Daniel S. Swetz, Joel N. Ullom

The readout requirements for instruments based on transition-edge sensors (TESs) have dramatically increased over the last decade as demand for systems with larger arrays and faster sensors has grown. Emerging systems are expected to contain many thousands