Physics & Astronomy Colloquium

Friday, September 23, 2022 - 3:10am to 4:00pm

DeMeritt Hall - Room 240

Speaker: Pat Gumann

Title: 

Quantum Computing Systems Based on Voltage Tunable Quantum Devices: from Ge Quantum Well Superconducting FET to WTe2 Monolayers 

Abstract:

Quantum computing is a fast-developing field pursue by many academic groups as well as industry R&D centers. I will give a short overview of the current state-of-the-art superconducting qubit-based quantum computing efforts and point out their technical challenges, followed by a few ideas on how to overcome those challenges. The solutions were motivated by studying two kinds of materials, a 'legend'-germanium on Si, and recently fabricated Josephson junctions based on monolayer-WTe2.
The extremely high hole mobilities attainable in strained germanium quantum wells could potentially provide a unique pathway to develop next generation of quantum computing systems whereas semi-metals like WTe2 will help us understand the underlying physics behind the coexistence of superconductivity and QSHE.

Bio:

Pat is currently a manager at IBM TJ Watson Research Center in Yorktown Heights, NY where he has been pursuing superconducting quantum computing since 2016 - and just this year he successfully cooldown (to 25mK) world's largest cryogenic system.

He received his PhD in experimental condensed matter physics from Darmstadt University of Technology in Germany, in 2007 and has worked at various research facilities over his career, including Leiden University, The Netherlands, the Institute for Solid State Physics at the University of Tokyo, the Low Temperature Laboratory at Kyoto University, The Institute for Quantum Computing at the University of Waterloo in Canada, and the Department of Physics at Harvard University. His research focus has ranged from quantum fluids and solids, quantum sensing, and for the past decade experimental quantum computing.

Please contact Michelle.Mancini@unh.edu for zoom link.