Physics Colloquium: Angela Kuo

The Department of Physics is pleased to welcome Prof. Angela Kuo for an in-person colloquium on Thursday, February 23, 2023. Kuo is an Assistant Professor of Condensed Matter Physics in the Grainger College of Engineering at the University of Illinois Urbana-Champaing. Her research interests are in topological materials, quantum simulation, and hybrid superconducting circuits. Prof. Kou’s work is at the interface between condensed matter physics and quantum information science, with a focus on topological materials. Her research uses superconducting circuits and scanned probe microscopies to build and investigate topological materials.

Abstract:

Building a hybrid quantum device from semiconducting spins and superconducting circuits

While there are currently many platforms for implementing qubits, no single type of qubit is currently ready to be included into a quantum computer. Some platforms are more better-suited as quantum memories while others may be better for quantum communications or operations. Recently, it has been suggested that building hybrid quantum systems that can harness the benefits of different platforms may be a useful model.

In this talk, I will discuss the benefits and disadvantages of coupling superconducting qubits to semiconducting spin qubits.  These two leading platforms have complementary benefits; semiconducting spin qubits have long lifetimes but are difficult to couple over long distances while superconducting qubits can be coupled over long ranges but have shorter lifetimes. I will show our experimental work coupling an Andreev spin qubit (ASQ) to a superconducting transmon. I will also mention some of the interesting phenomena we have mapped along the way using a superconducting transmon such as the anomalous Josephson effect and the phase diagram of a superconducting quantum dot system.