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Physics colloquium: Paul Dresselhaus, National Institute of Standards and Technology
January 16 @ 4:00 pm
“Quantum-based Measurements using Superconducting Josephson Devices at NIST”
Abstract: The Josephson Junction has been the basis for high precision electrical measurements starting soon after the discovery of the Josephson Effect. Since then, advances in both the fabrication technology and the circuit design have enabled these Josephson-based circuits to become the standards on which electrical measurements are base. This talk will highlight the efforts of the National Institute for Standards and Technology (NIST) in advancing the circuits and applications of Josephson Voltage Standards. Topics will include DC voltage measurements, ac voltage standards, temperature measurement (through Johnson noise thermometry), impedance measurements, superconducting digital computing and superconducting/magnetic memory.
Biography: Paul D. Dresselhaus received B.S. degrees in physics and electrical engineering from the Massachusetts Institute of Technology, in 1985 and the Ph.D. degree in applied physics from Yale University, in 1991. He was a Postdoctoral Assistant with State University of New York, Stony Brook, where he worked on the nanolithographic fabrication and study of Nb–AlOx–Nb junctions for single-electron and SFQ applications, single-electron transistors and arrays in Al–AlOx tunnel junctions, and the properties of ultrasmall Josephson junctions. He was with Northrop Grumman for three years, where he designed and tested gigahertz-speed superconductive circuits, including code generators and analog-to-digital converters. He also upgraded the simulation and layout capabilities at Northrop Grumman to be among the world’s best. In 1999, he joined the Quantum Voltage Project, the National Institute of Standards and Technology, Boulder, CO, where he has developed novel superconducting circuits and broadband bias electronics for precision voltage waveform synthesis and programmable voltage standard systems. Since 2015, he has been the Project Leader for the NIST Quantum Voltage Project.