Webex Link:
https://unilu.webex.com/unilu/j.php?MTID=md02f2ed96d762f609b65202003b4c484
Abstract:
The experimental advances of the last decades have made quantum correlated states of light and matter available in today’s laboratories, but the efficient characterization of their multipartite entanglement still poses a great challenge for theory and experiment. Mastering this challenge is a necessary step towards the large-scale implementation of ideas from quantum information theory with potential applications in the development of quantum technologies. Quantum parameter estimation theory, for instance, identifies strategies to overcome classical precision limits of measurements by identifying highly sensitive quantum states and measurement observables. This talk will provide an overview of our recent progress in this field, highlighting in particular the close connection between metrological sensitivity and multipartite entanglement. We will see how suitable observables that capture delicate features of complex quantum states can be identified under experimental constraints, how entanglement can be detected with tools from metrology, and how collective quantum enhancements can be achieved in the simultaneous estimation of multiple parameters. As applications we will show how this theory can improve the precision of atomic clocks and the optical resolution of imaging systems.
Biography:
Manuel Gessner studied in Freiburg, Madrid and Berkeley and he obtained PhD in Physics from the University of Freiburg in 2015 (topic: characterization of multipartite quantum systems in quantum optics and with trapped ions). From 2015 till 2018 he joined LENS, Florence, Italy as a Humboldt fellow to do a postdoc (topic: quantum interferometry and cold atoms). Since 2018 he is a Junior Research Chair at Ecole Normale Superieure, Paris (topic: quantum information and metrology, collaborates with local groups at the Laboratoire Kastler Brossel)