Quantum Nanostructures and
Nanofabrication Group

Prof. Karl K. Berggren and Dr. P. Donald Keathley

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.


New Publication “Superconducting nanowire single-photon detector with integrated impedance-matching taper”
Conventional readout of a superconducting nanowire single-photon detector (SNSPD) sets an upper bound on the output voltage to be the product of the bias current and the load impedance, IB... Read more >>
New Publication “Influence of tetramethylammonium hydroxide (TMAH) on niobium nitride thin films”
Functionality of superconducting thin-film devices such as superconducting nanowire single photon detectors stems from the geometric effects that take place at the nanoscale. The engineering of these technologies requires high-resolution... Read more >>
New video “Studying Superconducting Thin Films”
Summer Program: Studying superconducting thin film This summer, Lily Hallett investigated superconducting MoN thin films for use in nanowire single-photon detectors. She optimized deposition conditions for DC Magnetron Sputtering of... Read more >>
New Publication “Frequency Pulling and Mixing of Relaxation Oscillations in Superconducting Nanowires”
Many superconducting technologies such as rapid single-flux quantum computing and superconducting quantum-interference devices rely on the modulation of nonlinear dynamics in Josephson junctions for functionality. More recently, however, superconducting devices... Read more >>
Navid Abedzadeh awarded Best Electron Beam and Emily Toomey, Marco Colangelo and Navid Abedzadeh got an honorable mention at EIPBN Micrograph Contest 2018
Congratulations to Navid Abedzadeh for being awarded Best Electron Beam and congratulations to Emily Toomey, Marco Colangelo and Navid Abedzadeh for the honorable mention in the Micrograph Contest at this... Read more >>

The nanocryotron: A superconducting-nanowire three-terminal electrothermal device