Detecting EPR Steering and Multipartite Entanglement with Tools from Metrology
September 21st, 2021 MANUEL GESSNER École Normale Supérieure
Laboratoire Kastler Brossel

The sensitivity of quantum states under small perturbations is the quantity of central interest in quantum metrology. Besides identifying strategies that lead to quantum-enhanced measurement precision, the metrological sensitivity provides detailed information about the state’s quantum correlations. We discuss metrological witnesses that reveal the multipartite entanglement structure, generalizing entanglement depth and k-separability. Furthermore, we use a metrological complementarity relation to formulate the Einstein-Podolsky-Rosen (EPR) paradox and to build a witness for EPR steering, a stronger form of entanglement. Metrological entanglement witnesses are able to capture delicate features of non-Gaussian quantum states and can be systematically optimized given any set of measurable observables.

All interested may join this session.

Tuesday, September 21, 2021, 12:00. SMR and Online (Teams)

Hosted by Prof. Antonio Acín