Abstract:
Josephson junction-based quantum circuits have enabled broad exploration into open quantum systems in the microwave frequency domain. The combination of coherent quantum bits, robust single qubit control, entangling gates, and quantum noise-limited parametric amplifiers has yielded an unprecedented view into the physics of quantum measurement and dissipation. I will discuss our recent experimental work that focuses on harnessing entangled states to perform measurements beyond the capabilities of unentangled sensors. Key topics will include discussion of an entanglement-enabled probe of non-Markovian dynamics and time-travel-inspired metrology protocols.

Short bio: Kater Murch is an experimental physicist and professor in the Department of Physics at Washington University in St. Louis. His research focuses on quantum measurement and quantum information science, particularly exploring the boundary between quantum and classical physics. Murch received his Ph.D. in Physics from the University of California, Berkeley in 2008. After completing postdoctoral research at UC Berkeley, he joined the faculty at Washington University in St. Louis in 2013. At WashU, Murch leads a research group that investigates quantum measurement and control of superconducting quantum circuits. Some of their notable work includes experiments on quantum trajectory theory, quantum feedback, and weak measurement. Murch is currently co-director for the Center for Quantum Sensors at WashU and a board member of the Quantum Energy Initiative.