The frontier of information processing lies in nanoscience and nanotechnology research. At the nanoscale, materials, and structures can be engineered to exhibit interesting new properties, some based on quantum mechanical effects. Our research focuses on developing nanofabrication technology at the few-nanometer length scale. We use these technologies to push the envelope of what is possible with photonic and electrical devices, focusing in particular on superconductive and free-electron devices. Our research combines electrical engineering, physics, and materials science and helps extend the limits of nanoscale engineering.
The nanocryotron: A superconducting-nanowire three-terminal electrothermal device
Recent QNN News
QNN Newsletter from IAP 2026
Dear QNN Group Members, Alums and Affiliates, Hope everyone is enjoying the start to Spring! We are excited to share updates from the QNN group over the last months. It has been a while since our last newsletter, so a lot of activity to report. In particular we...
New Publication: Electron energy loss spectroscopy of two-dimensional materials in a scanning electron microscope
A new publication written by the group on the characterization of 2D materials in a scanning electron microscope was published in Physical Review B. John W. Simonaitis, Joseph A. Alongi, Benjamin Slayton, William P. Putnam, Karl K. Berggren, and Phillip D. Keathley,...
New Publication on High-speed testing of superconducting electronics
A new publication written by the group on custom sensing equipment was recently published in the Journal of Instrumentation. Reed A. Foster, Stephen Kandeh, Owen Medeiros, Alejandro Simon, Matteo Castellani, and Karl K. Berggren. 2025. “Time-Tagging Data...
New Publication: Photolithography-compatible three-terminal superconducting switch for driving CMOS loads
A new paper written by the group was recently published in Physical Review Applied. Dip Joti Paul, Tony X. Zhou, Karl K. Berggren, “Photolithography-compatible three-terminal superconducting switch for driving CMOS loads,” Physical Review Applied, 24, 2, p. 024060,...
Community Outreach Event: Appalachian Optics Outreach Event 2025
On July 14th, QNN group co-leader Dr. P. “Donnie” Keathley led a successful hands-on optics workshop for middle and high school teachers in Eastern Kentucky. This is hopefully the first of many outreach workshops in the coming years. With coordination from the local...