Integration of Graphene-Based Superconducting Quantum Circuits in a Three-Dimensional Cavity

  • Event Date: 2025-11-24
  • Quantum information and communication
  • Speaker: Prof. Kuei-Lin Chiu (Dept. of Physics, NSYSU)  /  Host: Prof. Chung-Hsien Chou (NCKU)
    Place: R36173, 1F, Dept. of Physics, Building of Science College, NCKU

Time:12:10, Monday, November 24, 2025
Speaker:Prof. Kuei-Lin Chiu
              Dept. of Physics, NSYSU
Title: Integration of Graphene-Based Superconducting Quantum Circuits in a Three-Dimensional Cavity
Place : R36173, 1F, Dept. of Physics, Building of Science College, NCKU

Abstract:
Integrating two-dimensional (2D) materials into circuit quantum electrodynamics (cQED) devices has emerged as an active research direction in recent years. Such integration not only enables the exploration of potential applications in quantum information processing but also provides a platform for probing the fundamental properties of these materials using microwave techniques. While most studies employ two-dimensional coplanar architectures with strong scalability potential, three-dimensional (3D) cavity-based cQED devices offer faster turnaround for investigating composite Josephson junctions (JJs) and greater flexibility in tuning the qubit–cavity coupling.

In this talk, we will present a series of graphene-based transmons integrated with various 3D cavities. In the first part, we demonstrate a range of qubit–cavity coupling scenarios realized using single- and two-qubit devices paired with 3D cavities of different resonant frequencies. In the second part, we discuss a possible supersplitting effect observed in a system where two cavity modes are coupled to the same graphene transmon.

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