Group Seminar at MPQ and Zoom:Quantum enhanced sensing with spinor atomic condensates in linear and nonlinear interferometries

Prof Li Yuo, Tsinghua University, China
Group seminar at MPQ lecture hall and Zoom
Tuesday, 18 June, 09:00am (MEZ)

Abstract: Statistical inference of a parameter based on measurements from an ensemble of uncorrelated particles is lower bounded by the classical precision limit or the standard quantum limit (SQL). Quantum entangled ensembles can beat the SQL. Several paradigms for such enhanced interferometries will be discussed, and experimental demonstrations with spinor atomic Bose-Einstein condensates reported. Many-atom squeezed states, entangled states with reduced quantum noise, are deterministically generated and applied in linear interferometry [1,2,3]; effective time-reversed evolutions of entanglement generating interactions are implemented in nonlinear interferometry to amplify signal preferentially over noise [4,5,6], both observing quantum enhanced precisions.