Quantum-enhanced sensing and metrology uses quantum resources like entanglement and squeezed states to achieve the precision and accuracy beyond that of the conventional schemes, and has demonstrated successfully in various tasks including gravitational wave detection, astronomical imaging etc. To fully achieve its advantage in practical applications requires the design of noise-tolerant schemes to counteract experimental imperfections, as well as to go beyond the single-parameter scenario since most sensing applications involve multiple parameters. In this talk I will present our recent works in the field of quantum-enhanced sensing, including 1. approaching the fundamental limit of target detection in the presence of background noise using quantum entanglement and/or quantum detections; 2. precision metrology using quantum weak measurement and its applications in parameter estimation with practical detectors as well as the characterization of quantum systems; 3. quantum-limited location of a single emitter and resolutions of two emitters in the three-dimensional space, two fundamental tasks in imaging. Our results may find wide applications from microscopy, Lidar to astrometry.
 

Lijian received his B.S. and M. Eng. degrees at Peking University, China. He then moved to University of Oxford in UK and received his D.Phil degree in Atomic and Laser Physics. After the graduation he stayed at University of Oxford as a postdoctoral research assistant. In 2011 he joined the Max-Planck Institute for Structures and Dynamics of Matter in Hamburg as a Humboldt research fellow. Since 2013 he has been a professor at Nanjing University in China. His research interests include the generation, manipulation and detection of non-classical states of light, and their applications in communication, metrology, computation and simulation. He has published 54 papers in international refereed journals including Science, Nature Photonics, Nature Materials, Physical Review Letters etc.

Please contact phweb@ust.hk should you have questions about the talk.