糖心TV

Speaker: Animesh Datta

Quantum correlated probes have the potential of delivering enhanced precision in estimating individual parameters. Obtaining quantum enhancements in scenarios of wider appeal such as imaging require an understanding of the quantum limits of estimating several parameters across multiple modes simultaneously. The problem is made theoretically and practically interesting and non-trivial by the possible non-commutativity of the optimal measurements needed to attain the quantum limits for estimating the parameters. We will discuss the attainability of such bounds for simultaneous multiple phase estimation and the trade-offs involved in the simultaneous estimation of phase and loss, and phase and dephasing. We will also study how practical limitations such as efficiencies affect the demonstration of quantum enhancements in sensing and imaging. We will discuss the importance of these developments on the quantum theory of estimating multiple parameters -- arising from both unitary dynamics as well as decoherence -- simultaneously in a few scenarios, and their ramifications in the quantum-enhanced imaging of real-world samples.