Asia Pacific Physics Week 2023 (APPW2023)

Friday, Nov. 10, 2023 

3:20 PM - 4:00 PM  Plenary Talk  Shangjr (Felix) Gwo (National Tsing-Hua University) 

Material physics in the quantum era

Shangjr Gwo

Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan

The quantum era is coming, and quantum computing, quantum cryptography, and quantum sensing are expected to be game changers for the future technologies requiring ultimate computing power, data security, and sensing capability. Especially, in the past few years, the advances in quantum research have accelerated the expected coming of quantum era. Despite most of quantum computers and quantum sensors are based on simple metals working in their superconducting state, there are still material issues to be resolved for quantum devices. For example, aluminum (Al) is widely deployed in superconducting quantum bit (qubit) and niobium (Nb) is used in superconducting quantum interference devices (SQUID, a very sensitive magnetometer). However, material purity and perfection play an important role in the qubit performance, such as dephasing (decoherence) time, which limits the power of quantum computer. Moreover, extremely high material uniformity is necessary for the development of large-scale quantum sensor arrays. In this talk, I will present our recent efforts in improving Al, Nb, and titanium nitride (TiN) superconducting epitaxial films, as well as silver (Ag) epitaxial film for topological photonic applications.