Febrero 21, 2025
11:00h
Advances in multiparameter quantum sensing and metrology
Where and when
Date
Febrero 21, 2025
11:00h
Location
Salón de Grados Lise Meitner. Bloque C, Facultad de Físicas (UV)
Featured speakers
Augusto Smerzi
Professor National Institute of Optics, National Research Council (INO-CNR) and European Laboratory for Non-linear Spectroscopy (LENS), Florence, Italy
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Augusto Smerzi is Research Director at the Optics National Institute of the National Research Council (CNR-INO), co-director and leader of the theoretical group of the Quantum Science and Technology in Arcetri (QSTAR) institute, Florence. The group is internationally renowned for the quantum theory of phase estimation and the use of statistical speeds to characterize multipartite entanglement. These results have established the Fisher information as a tool for the characterization of complex quantum states and their metrological usefulness. Furthermore, the group has established expertise in the study of the nonlinear dynamics of coherent matter waves in the context of dilute, trapped Bose-Einstein condensates.
Multiparameter quantum sensing and metrology enable the simultaneous estimation of multiple parameters, with applications ranging from atomic clock networks for enhanced synchronization to optical imaging and magnetic field mapping in medicine and biology. These techniques exploit quantum resources such as entanglement and squeezing to surpass the limitations of independent sensors. However, challenges like quantum incompatibility and measurement complexity, make optimization and practical implementation highly demanding.
In this talk I will explore recent advancements in addressing these challenges, with a focus on distributed quantum sensing. We will demonstrate how this approach can overcome the shot-noise limit for estimating arbitrary linear combinations of multiple phase shifts, provided that the non-classical probe state exhibits anti-squeezed quadrature variance. Furthermore, we compare the sensitivity bounds of this protocol to those achievable with d independent Mach-Zehnder interferometers, each probed with a non-classical state and a coherent state. Our findings reveal that while independent interferometers can match the sensitivity of the entangled protocol, they require d non-classical states instead of a single one, highlighting the resource efficiency of the entangled strategy. Acknowledgements: This work has been partially supported by the NQSTI
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