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Quantum Shannon theory and quantum Darwinism

The emergence of the classical world from quantum theory, and especially of a consensus among different observers, is a long-standing problem for the foundations of quantum theory. Using recent advances in multipartite quantum information theory, we shed light on these problems. Besides their interest for fundamental physics, they are related to quantum sensing and metrology using a quantum-network of stations, a situation of interest for the potential use of quantum-based measurement probes for exploring space and the Universe.

France

19-D-A-03

University of Lyon
Quantum Metrology for Space-Based Tests of Gravitational Physics

This study aimed to develop a framework for studying the effects of spacetime curvature on the propagation of quantum states of light, and to compare them with the propagation of classical light. When distributing entangled photon pairs through a gravitational potential, the effect of spacetime curvature on the properties of quantum states can become significant. This could be relevant for plans to use satellites for global quantum key distribution.

Switzerland

17/A/04-b

University of Bern
Quantum Metrology for Space-Based Tests of Gravitational Physics

Testing the validity of general relativity at cosmological and microscopic scales is a challenging open question. The impediment at cosmological scales is our lack of understanding of dark matter and dark energy. At microscopic scales, it is the unknown effect of gravity on quantum mechanics. Recently, space-based matter wave interferometers have been proposed as candidates for addressing certain aspects of both these problems.

UK

17/A/04-a

University of Warwick

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