报告题目：The effectiveness of control theory in experimental quantum physics
报告人：Guofeng Zhang, Hong Kong Polytechnic University
The Kalman canonical form is a standard result in classical linear systems theory. In this talk, we discuss the Kalman canonical form for quantum linear control systems. Specifically, we show how this structural decomposition can be used to investigate decoherence-free modes, quantum non-demolition variables, and back-action evading measurements in quantum linear systems. The proposed theory will be demonstrated by several experiments from quantum optics and opto-mechanical systems, including:
1. Optomechanical dark mode, Dong et al., Science, 338:609--1613, 2012.
2. Quantum backaction evading measurement of collective mechanical modes, Ockeloen-Korppi, et al., Physical Review Letters, 117:140401, 2016.
3. Quantum mechanics–free subsystem with mechanical oscillators, de Lepinay, et al., Science 372:625--629, 2021.
4. Light-mediated strong coupling between a mechanical oscillator and atomic spins 1 meter apart, Karg, Science 369:174--179, 2020.
Guofeng Zhang received his B.Sc. degree and M.Sc. degree from Northeastern University, Shenyang, China, in 1998 and 2000 respectively. He received a Ph.D. degree in Applied Mathematics from the University of Alberta, Edmonton, Canada, in 2005. During 2005-2006, he was a Postdoc Fellow at the University of Windsor, Windsor, Canada. He joined the School of Electronic Engineering of the University of Electronic Science and Technology of China, Chengdu, China, in 2007. From April 2010 to December 2011 he was a Research Fellow at the Australian National University. He is currently an Associate Professor in the Department of Applied Mathematics at the Hong Kong Polytechnic University. His research interests include quantum information and control, and quantum algorithm.