Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	Associate Professor Guofeng Zhang，Hong Kong polytechnic University
Inviter:	骆顺龙研究员
Title:	The effectiveness of control theory in experimental quantum physics
Language:	Chinese
Time & Venue:	2023.08.10 10:00-11:00 思源楼713
Abstract:	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, for example: 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.