Speaker: Professor Matteo G. A. Paris，University of Milan

Inviter: 张悦

Title: Multiparameter Quantum Estimation: What? Why? How?

Language: English

Time & Venue: 2026.09.14 10:00-11:00

Abstract: Quantum metrology leverages quantum resources to surpass the precision limits of classical sensing. While the single-parameter case is reasonably well-understood, the simultaneous estimation of multiple parameters presents a far richer set of problems and challenges . In fact, multiparameter estimation is not merely a technical extension: First, at the measurement stage, the best measurement strategy for one parameter may collide with the best strategy for another. This incompatibility arises when the optimal measurements for different parameters do not commute. This quantum mechanical trade-off prevents the simultaneous saturation of the QCRB for all parameters. Second, there is a challenge at the encoding stage: sloppiness, which arises when different combinations of parameters produce nearly identical output states, making them practically indistinguishable. In this talk, I will provide a general introduction to estimation theory and its multiparameter extension, illustrating interesting problems and recent results.