Many-body dynamics in driven-dissipative superconducting quantum circuits
Abstract: Superconducting circuits offer a scalable platform for exploring many-body physics in synthetic quantum matter comprised of microwave photons. In this talk, I will first present our recent experiments on quantum transport in superconducting circuit lattices, where we introduce a new method to measure in-situ particle current and current statistics. By coupling a 1D Bose-Hubbard lattice to engineered particle source and drain, we observe energy-dependent current in discrete conduction channels and interaction-assisted transport. Next, I will discuss how we use the same engineered particle baths to perform site-resolved tunneling spectroscopy, measuring quasi-hole and quasi-particle spectra and extracting spatial and temporal properties of collective lattice excitations. These results demonstrate a versatile platform for controlling and probing complex quantum dynamics using both coherent and driven-dissipative techniques. I will discuss our ongoing efforts to apply this toolset to generate novel entangled many-body states in circuit-based quantum simulators.
Bio: Alex Ruichao Ma received his Ph.D. in Physics from Harvard University in 2014, where he studied many-body physics using ultracold atoms in optical lattices. From 2015 to 2019, he worked on superconducting qubits for quantum simulation as a Kadanoff-Rice Postdoctoral Fellow at the James Franck Institute, University of Chicago. In 2019, Alex joined Purdue University as an Assistant Professor in the Department of Physics and Astronomy. His experimental group focuses on quantum many-body physics and quantum information science using superconducting circuits. He is a recipient of the NSF CAREER Award in 2022.
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