Time: 12:10, Monday, November 27, 2023
Speaker: Prof. Kuei-Lin Chiu
               Dept. of Physics, NSYSU
Title: Flux tunable graphene-based superconducting quantum circuits coupled to 3D cavity
Place : R36173, 1F, Dept. of Physics, Building of Science College, NCKU

Abstract:

Correlation between transmon and its composite Josephson junctions (JJ) plays an important role in designing new types of superconducting qubits based on quantum materials. It is desirable to have a type of device that not only allows exploration for use in quantum information processing but also probing intrinsic properties in the composite JJs. Here, we construct a flux-tunable 3D transmon-type superconducting quantum circuit made of graphene as a proof-of-concept prototype device. This 3D transmon-type device not only enables coupling to 3D cavities for microwave probes but also permits DC transport measurements on the same device, providing useful connections between transmon-related parameters and critical currents associated with JJ’s properties. Our study paves the way towards integrating novel materials for exploration of new types of quantum devices for future technology while probing underlying physics in the composite materials.