Środowiskowe Seminarium z Informacji i Technologii Kwantowych

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 well as practically interesting and non-trivial by the possible non-commutativity of the optimal measurements needed to attain the quantum limits for estimating individual parameters. We present developments on the quantum theory of estimating multiple parameters -- arising from both unitary dynamics as well as decoherence -- simultaneously in a few scenarios, and its ramifications in the imaging of real-world samples.