Physics Colloquium: Using quantum devices to study materials

Microwave resonators and quantum bits (qubits) are extremely important devices in the context of quantum information. While much progress has been made recently towards a universal quantum computer, decoherence is still a limiting factor. Sources of decoherence are introduced from both materials and from coupling to electronics required for measurements. This talk will show how microwave resonators and qubits can be used to understand these sources of decoherence. Dr. Wisbey will also discuss his recent work with low temperature tunable microwave resonators fabricated with stoichiometric and multilayer titanium nitride, oxidized niobium resonators, and superconducting microwave resonators with deposited hexagonal boron nitride and graphene. Finally, Dr. Wisbey will discuss his progress in measuring the effects of deposited oxygen on the coherence times of a qubit in an ADR.

Dr. David Wisbey researches materials for quantum information and teaches physics at Saint Louis University. Following his Ph.D. in condensed matter physics, he switched to a new area of physics: Quantum information. Currently he is incorporating hexagonal boron nitride and graphene into microwave resonators.