【校庆115周年活动预告】A Compact Spectrometer for the Orbital Angular Momentum of Light
报告人：邓慧 副教授 美国物理学会会士 密歇根大学物理系
报告摘要：Light has both polarization and orbital angular momentum. The former has two orthogonal states and have been widely exploited as qbits in quantum information science. The latter, has infinite number of orthogonal states, is a candidate as qdits for quantum computing in higher-dimensional Hilbert spaces and quantum communication with high information capacities.
There are very limited ways to measure the orbital-angular momentum (OAM) state of light when it is not an eigen-state of OAM. In this talk, I will briefly introduce OAM of light, quantum counter-factual measurements, and quantum Zeno effect. Then I will introduce a scheme to sort OAM of light utilizing the quantum counter-factual measurement and quantum Zeno effect. The scheme requires only one interferometer and can separate different OAM components of an unknown input state into different, pre-determined, time intervals at the output, with high extinction ratio between different OAM components.
邓慧简介：Dr. Hui Deng is Associate Professor of Physics at the University of Michigan, Ann Arbor. She received BS in Applied Physics from Tsinghua University, China in 1999 and Ph.D. in Applied Physics from Stanford University in 2006. Prof. Deng research has attracted more than $8M as PI and over $10M as co-PI. She has published more than 50 journal articles with over 4000 citations, and has delivered many conference presentations and invited talks/lectures/seminars. Dr. Deng is a topical editor of the 2nd Edition of the Encylopeida of Modern Optics (Elsivier, 2017). She also served on many conference committees and funding review panels, and as a referee for numerous scientific journals. Prof. Deng is an elected Fellow of the APS.