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Search Publications by: Johannes Hubmayr (Fed)

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Displaying 1 - 25 of 34

Demonstration of a 1,820 channel microwave superconducting quantum1 interference device multiplexer for transition-edge sensor bolometers

July 15, 2025
Author(s)
John Groh, Jason Austermann, James Beall, Shannon Duff, Johannes Hubmayr, Richard Lew, Michael Link, Tammy Lucas, John Mates, Robinjeet Singh, Joel Ullom, Leila Vale, Jeffrey Van Lanen, Michael Vissers
The scalability of most transition-edge sensor arrays is limited by the multiplexing technology which combines their18 signals over a reduced number of wires and amplifiers. In this letter, we present and demonstrate a new multiplexer19 design optimized

280-GHz aluminum MKID arrays for the Fred Young Submillimeter Telescope

May 29, 2025
Author(s)
Anna Vaskuri, Jordan Wheeler, Jason Austermann, Michael Vissers, James Beall, James R. Burgoyne, Victoria Butler, Scott Chapman, Steve K. Choi, Abigail Crites, Cody J. Duell, Rodrigo Freundt, Anthony Huber, Zachary Huber, Johannes Hubmayr, Jozsef Imrek, Ben Keller, Lawrence Lin, Alicia Middleton, Michael D. Niemack, Thomas Nikola, Douglas Scott, Adrian Sinclair, Ema Smith, Gordon Stacey, Joel Ullom, Jeffrey Van Lanen, Eve Vavagiakis, Samantha Walker, Bugao Zou
First light observations of the 280 GHz instrument module of the Fred Young Submillimeter Telescope (FYST) in the CCAT Collaboration are expected in 2026. The focal plane of this module will consist of three superconducting microwave kinetic inductance

EMI susceptibility of a differential time-division SQUID multiplexing circuit for TES readout

January 3, 2025
Author(s)
Malcolm Durkin, Douglas Bennett, William Doriese, Johnathon Gard, Johannes Hubmayr, Richard Lew, Erin Maloney, Carl Reintsema, Robinjeet Singh, Daniel Schmidt, Joel Ullom, Leila Vale, Michael Vissers
Time Division multiplexing (TDM) using superconducting quantum interference devices (SQUIDs) is being developed to read out Transition-edge sensor arrays for the Athena X-ray integral field Unit (X-IFU) and Cosmic Microwave Background Stage-4, which have

The Simons Observatory: Production-Level Fabrication of the Mid- and Ultra-High-Frequency Wafers

May 4, 2024
Author(s)
Shannon Duff, Jason Austermann, James Beall, David Daniel, Johannes Hubmayr, Gregory Jaehnig, Bradley Johnson, Dante Jones, Michael J. Link, Tammy Lucas, Rita Sonka, Suzanne Staggs, Joel Ullom, Yuhan Wang
The Simons Observatory (SO) is a cosmic microwave background instrumentation suite in the Atacama Desert of Chile. More than 65,000 polarization-sensitive transition-edge sensor (TES) bolometers will be fielded in the frequency range spanning 27 to 280 GHz

A High-Capacity Microwave SQUID Multiplexer Chip Screening System

March 21, 2023
Author(s)
Zachary Whipps, Jake A. Connors, Bradley Dober, Johannes Hubmayr, John Mates, Caleb Wheeler, John Groh, Jason Austermann, Leila Vale, Gene C. Hilton, Jiansong Gao, Shannon Duff, Joel Ullom, Ed Denison
The microwave SQUID multiplexer ($\mu$MUX) is a high channel-count multiplexer that, when coupled to low-temperature detectors such as Transition Edge Sensor (TES) Bolometers, has applications across astronomy and physics. Our primary application is for

Performance of a Kinetic-Inductance Traveling-Wave Parametric Amplifier at 4 Kelvin: Toward an Alternative to Semiconductor Amplifiers

April 5, 2022
Author(s)
Maxime Malnou, Joe Aumentado, Michael Vissers, Jordan Wheeler, Johannes Hubmayr, Joel Ullom, Jiansong Gao
Most microwave readout architectures in quantum computing or sensing rely on a semiconductor amplifier at 4\,K, typically a high-electron mobility transistor (HEMT). Despite its remarkable noise performance, a conventional HEMT dissipates several

Sub-kelvin thermometer for on-chip measurements of microwave devices utilizing two-level systems in superconducting microresonators

November 13, 2021
Author(s)
Jordan Wheeler, Michael Vissers, Maxime Malnou, Johannes Hubmayr, Joel Ullom, Jiansong Gao
The design, implementation, and sensitivity of a new microwave multiplexable superconducting resonator thermometer based on two-level-systems are presented. The thermometer operates from 1 K to 50 mK and has the potential to measure down to 5 mK. The

Demonstration of 220/280 GHz Multichroic Feedhorn-Coupled TES Polarimeter

January 3, 2020
Author(s)
Samantha L. Walker, Carlos E. Sierra, Jason E. Austermann, James A. Beall, Daniel T. Becker, Bradley J. Dober, Shannon M. Duff, Gene C. Hilton, Johannes Hubmayr, Jeffrey L. Van Lanen, Jeff McMahon, Sara M. Simon, Joel N. Ullom, Michael R. Vissers
We describe the design and measurement of feedhorn-coupled, transition-edge sensor (TES) polarimeters with two passbands centered at 220 GHz and 280 GHz, intended for observations of the cosmic microwave background. Each pixel couples polarized light in

High-Throughput, DC-Parametric Evaluation of Flux-Activated-Switch-Based TDM and CDM SQUID Multiplexers

March 12, 2019
Author(s)
Carl D. Reintsema, Douglas A. Bennett, Edward V. Denison, Malcolm S. Durkin, William B. Doriese, Joseph W. Fowler, Johnathon D. Gard, Arpi L. Grigorian, Gene C. Hilton, Johannes Hubmayr, Galen C. O'Neil, John A. Mates, Kelsey M. Morgan, Daniel R. Schmidt, Robert W. Stevens, Daniel S. Swetz, Leila R. Vale, Joel N. Ullom, Kent D. Irwin, Saptarshi Chaudhuri, Charles J. Titus, Carl S. Dawson
The successful realization and broad deployment of transition edge sensor (TES)-based detector systems has led to significant demand for time-division and code-division superconducting quantum interference device (SQUID) multiplexers time division

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

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

Low-Temperature Detectors for CMB Imaging Arrays

August 3, 2018
Author(s)
Johannes Hubmayr, Jason E. Austermann, James A. Beall, Daniel T. Becker, Bradley J. Dober, Shannon M. Duff, Jiansong Gao, Gene C. Hilton, Christopher M. McKenney, Joel N. Ullom, Jeffrey L. Van Lanen, Michael R. Vissers
We review advances in low-temperature detector (LTD) arrays for cosmic microwave background (CMB) polarization experiments, with a particular emphasis on imaging arrays. We briefly motivate the science case, which has spurred a large number of independent

Millimeter-Wave Polarimeters Using Kinetic Inductance Detectors for TolTEC and Beyond

March 8, 2018
Author(s)
Jason Austermann, James A. Beall, Sean A. Bryan, Bradley Dober, Jiansong Gao, Gene C. Hilton, Johannes Hubmayr, Phillip Mauskopf, Christopher M. McKenney, S M. Simon, Joel Ullom, Michael Vissers, G W. Wilson
Microwave kinetic inductance detectors (MKIDs) provide a compelling path forward to the large-format polarimeter, imaging, and spectrometer arrays needed for next-generation experiments in millimeter-wave cosmology and astronomy. We describe the

Superconducting micro-resonator arrays with ideal frequency spacing

December 20, 2017
Author(s)
Xiangliang Liu, Weijie Guo, Y Wang, M Dai, L F. Wei , Bradley J. Dober, Christopher M. McKenney, Gene C. Hilton, Johannes Hubmayr, Jason E. Austermann, Joel Ullom, Jiansong Gao, Michael Vissers
We present a wafer trimming technique for producing superconducting micro-resonator arrays with highly uniform frequency spacing. With the light-emitting diode mapper technique demonstrated previously, we first map the measured resonance frequencies to the

Microwave SQUID Multiplexer for Cosmic Microwave Background Imagers

October 11, 2017
Author(s)
Bradley J. Dober, Daniel T. Becker, Douglas A. Bennett, Sean A. Bryan, Shannon M. Duff, Johnathon D. Gard, James P. Hays-Wehle, Johannes Hubmayr, John A. Mates, Carl D. Reintsema, Leila R. Vale
Key performance characteristics are demonstrated for the microwave SQUID multiplexer (µmux) coupled to transition edge sensor (TES) bolometers that have been optimized for cosmic microwave background (CMB) observations. In a 64-channel demonstration, we

Cryogenic LED pixel-to-frequency mapper for kinetic inductance detector arrays

July 12, 2017
Author(s)
Jiansong Gao, Xiangliang Liu, W Guo, Wei L.F., Christopher M. McKenney, Bradley J. Dober, Tasha Billings, Johannes Hubmayr
We present a cryogenic wafer mapper based on light emitting diodes (LEDs) for mapping a large microwave kinetic inductance detector (MKID) array. In this scheme, an array of LEDs, addressed by DC wires and collimated through horns onto the detectors, are

Counting Near Infrared Photons with Microwave Kinetic Inductance Detectors

May 22, 2017
Author(s)
Jiansong Gao, Michael R. Vissers, Joel N. Ullom, Johannes Hubmayr, Joseph W. Fowler, Leila R. Vale, Weijie Guo
We demonstrate photon counting at 1550~nm wavelength using microwave kinetic inductance detectors (MKIDs) made from TiN/Ti/TiN trilayer films with superconducting transition temperature $T_{c} \sim$ 1.4~K. The detector has a lump-element design with a

Broadband parametric amplifiers based on nonlinear kinetic inductance artificial transmission lines

April 11, 2017
Author(s)
Jiansong Gao, Saptarshi Chaudhuri, Dale Li, Kent D. Irwin, Clint Bockstiegel, Weijie Guo, Xiangliang Liu, Johannes Hubmayr
We present broadband parametric amplifiers based on the kinetic inductance of superconducting NbTiN thin films and an artificial (lumped-element) transmission line architecture. We demonstrate two amplifier designs implementing two different phase matching

Design of 280 GHz feedhorn-coupled TES arrays for the balloon-borne polarimeter SPIDER

July 7, 2016
Author(s)
Johannes Hubmayr, Jason E. Austermann, James A. Beall, Daniel T. Becker, Shannon M. Duff, Arpi L. Grigorian, Gene C. Hilton, Joel N. Ullom, Michael R. Vissers
We describe 280 GHz bolometric detector arrays that instrument the balloon-borne polarimeter spider. A primary science goal of spider is to measure large-scale B-mode polarization of the cosmic microwave back-ground (cmb) in search of the cosmic-inflation

Frequency-tunable Superconducting Resonators via Nonlinear Kinetic Inductance

August 13, 2015
Author(s)
Michael Vissers, Johannes Hubmayr, Jiansong Gao, Martin Sandberg, Saptarshi Chaudhuri, Clint Bockstiegel
We have designed, fabricated and tested a frequency-tunable high-Q superconducting resonator made from niobium titanium nitride film. The frequency tunability is achieved by injecting a DC current through a special current-directing circuit into the

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

Photon-noise limited sensitivity in titanium nitride kinetic inductance detectors

February 20, 2015
Author(s)
Johannes Hubmayr, James A. Beall, Daniel T. Becker, Hsiao-Mei Cho, Gene C. Hilton, Dale Li, David P. Pappas, Jeffrey L. Van Lanen, Mark Devlin, Kent D. Irwin, Chris Groppi, Phillip Mauskopf
We demonstrate photon-noise limited performance at sub-millimeter wavelengths in microwave kinetic inductance detectors (MKIDs) made of a new superconducting material, a TiN/Ti/TiN trilayer film. Optical coupling is achieved by use of feedhorns, a standard
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