Superconducting circuits provide a versatile platform for investigating many-body physics in synthetic quantum matter. Achieving scalable quantum simulation with these devices requires new methods for control and measurement. In this talk, I will present our recent experiments to control and probe quantum dynamics using both coherent and driven-dissipative techniques. First, I’ll discuss a set of transport experiments, where we develop an in-situ measurement of particle current and current statistics. By coupling a 1D Bose-Hubbard lattice to engineered particle source and drain, we study energy-dependent current dynamics and interaction-assisted transport. Next, we develop site-resolved tunneling spectroscopy using the particle baths as tunneling probes. We measure quasi-hole and quasi-particle spectra across the superfluid to Mott insulator transition and extract spatial and temporal properties of collective lattice excitations. I will discuss ongoing efforts to apply our toolset to generate novel entangled many-body states in circuit-based quantum simulators.
*You will need to bring your cell phone, so you can sign in using the QR code outside of ATL 2400. You will need to submit your first and last name, email, and affiliation on the form by 11:15am to be able to get lunch after the seminar. Lunch is first come, first served.*
At 4pm, there will be a tea in ATL 2117 for our speaker and students/postdocs - this is a chance to ask questions directly to our speaker. Refreshments will be served.
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.