Month: June 2021

Wigner’s friend through experiment: relativity of facts

[1] Facts are relative, Caslav Brukner, Nature Physics volume 16, pages 1172–1174 (2020),  [2] A no-go theorem for the persistent reality of Wigner’s friend’s perception (under review) Popular summary:  The quantum measurement problem is one of the most fundamental in quantum theory and its putative solutions are at the centre of controversy over their alternative interpretations. …

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New Scientist — Why Quantum is Relative

Quantum weirdness isn’t weird – if we accept objects don’t exist We can grasp the truth about the quantum world, as long as we abandon our most cherished assumption about what’s real and what’s not Further details here

Science et Vie — The whole universe would have originated from a Planck star

Where does our Universe come from? To this fundamental question, if any, the physicist Carlo Rovelli provides an answer based on a theory that attempts to unify Einstein’s general relativity with quantum mechanics: it would come from a Planck star, a tiny star born during a rebound … from a previous universe. Further details here. …

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phys.org: Testing Quantum Gravity with Non-Gaussianity

An international team of experts, led by the University of Nottingham, have demonstrated that only quantum and not classical gravity could be used to create a certain informatic ingredient that is needed for quantum computation. Their research “Non-Gaussianity as a signature of a quantum theory of gravity” has been published today in PRX Quantum. Please see the article …

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PhysicsWorld: Quantum gravity could be tested using ultracold atoms

Quantum gravity might soon be tested in the lab, thanks to a new analysis from our nodes in the UK, France and Hong Kong. Drawing on advances in quantum information science, the researchers have found that if gravity is fundamentally quantum rather than classical it must generate a signature known as non-Gaussianity. To look for …

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