Probing Quantum Correlations Through Incompatible Measurements
March 5th, 2020 ROOPE UOLA Univeristy of Geneva

Quantum correlations give rise to various non-classical effects such as Bell non-locality, quantum steering and contextuality, which have led to novel technological applications in the areas of computation, metrology and cryptography. Future improvements of these protocols require a thorough understanding of the quantum resources responsible for the related non-classical advantage. Commonly, quantum resources are probed through properties of quantum states such as entanglement and coherence. Interestingly, these properties are known to be necessary but not sufficient for the quantum advantage in many crucial applications.

In this talk, I will present an overview of our research on quantum resources from the perspective of quantum measurement theory. Quantum measurement theory is a mathematical framework that gives properties of quantum measurements such as incompatibility, unavoidable disturbance and coexistence an operationally motivated description. In contrast to the widely used non-classical properties of quantum states, the non-classical properties of quantum measurements can characterise the quantum advantage in tasks based on quantum steering, contextuality, and macrorealism. Interestingly, quantum measurement theory has been studied systematically already some decades before the related correlation tasks have received their modern formulation. Despite this time difference, and possibly partly because of it, all the subfields have benefited greatly from the one-to-one connections.

Seminar, March 5, 2020, 12:00. ICFO’s Seminar Room

Hosted by Prof. Antonio Acín