CMP/AMO Seminar - Speaker Dr. Alex Ruichao Ma, Purdue University

Speaker: Dr. Alex Ruichao Ma, Purdue University

Host: Prof. Hailong Wang

Title: Controlling and probing quantum correlations in superconducting circuits

Abstract: Superconducting circuits provide a versatile platform for exploring many-body physics in synthetic quantum matter. To advance scalable quantum simulation using circuit devices, I will present our recent progress in developing efficient techniques for controlling and measuring quantum correlations and dynamics. We engineer tunable driven-dissipative baths and apply them in coupled superconducting qubit arrays to autonomously stabilize entangled states. Additionally, we investigate how collective qubit decay can be harnessed and combined with coherent control to generate quantum correlations in qubit lattices. To characterize the resulting quantum states, I will show our new methods to measure in-situ particle current and perform site-resolved tunneling spectroscopy. We apply these tools to probe quantum transport and phase transitions in a circuit Bose-Hubbard lattice.

Short 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.