Quantum Sensing in the presence of measurement-induced phase transitions - Giovanni Di Fresco

Quantum Sensing in the presence of measurement-induced phase transitions
Giovanni Di Fresco, University of Palermo
Abstract: The development of various theoretical frameworks that exploit the properties of quantum systems to gain advantages over their classical counterparts has been driven by technological advances over the past two decades. These new scenarios now make it possible to prepare and manipulate quantum systems in the laboratory. It goes without saying that the idea of harnessing quantum features to devise metrological schemes is very attractive and widely studied, owing to the enormous boost in the estimation accuracy of physical quantities. More precisely, the idea is to optimize the estimation by exploiting the properties of the input probe (the quantum system) and the measurement process (the measurement operator, e.g., POVMs). An interesting feature that a quantum many-body system offers is that, near a quantum critical point, huge precision can be achieved by exploiting fewer experimental resources than its classical counterpart. The interplay between a deterministic quantum evolution and a series of measurement processes can lead to a sudden change in the entanglement properties of a system, a phenomenon known as a measurement-induced phase transition (MIPT). In our work, we analyze some metrological properties of systems undergoing MIPT.
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