Highlights

An Interview with Jeremy Butterfield: At the Crossroads Between Physics and Philosophy

In a recent interview, Jeremy Butterfield, a prominent philosopher of science, shared his analysis of the evolution of this discipline over the decades. Butterfield highlighted the emergence of the philosophy of physics, thanks notably to revolutionary developments such as Bell’s theorem. This theorem, formulated in the 1960s by physicist John Bell, marked a major turning …

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Time-delocalised variables violating causal inequalities

A piece accessible to a broader public on collaborative work between Julian Wechs and Ognyan Oreshkov  (Université libre de Bruxelles) and Cyril Branciard (CNRS) has been posted on several different portals. Read it at the following links phys.org, eurekalert, alphagalileo, ULB press A team of researchers from the Université libre de Bruxelles and the French …

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Testing for Quantum Gravity with Bose-Einstein Condensates

The multimode collaborative work `Non-gaussianity as a Signature of a Quantum Theory of Gravity’ between Hong Kong, Aix-Marseille and Oxford you, lead by Richard Howl and with the participation of Marios Christodoulou, Carlo Rovelli and Vlatko Vedral, has been published in PRX Quantum. Below is an accessible to the non-specialist summary. For over a hundred years, physicists …

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The quantum flip

By Giulio Chiribella and Zixuan Liu.  Pre-publication link. At the microscopic level, the fundamental laws of physics are time symmetric: every fundamental process admits a time-reversal, which describes the same physics seen from the point of view of an observer with an inverted arrow of time. In stark contrast, our everyday experience and our laboratory practice …

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Quantum Reference Frames

When we think operationally about space and time, we usually assume that the objects we use as reference frames are classical systems – like a macroscopic heavy ruler or a clock with sharply defined hands.  Quantum reference frames have recently been introduced as a formalism to describe physics when rulers and clocks are assumed to …

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Witnessing non-classicality beyond quantum theory

Witnessing non-classicality beyond quantum theory. Published in Physical Review D. By Chiara Marletto (QISS Oxford Physics) and Vlatko Vedral (QISS Oxford Physics). Popular Summary: This paper provides the strongest theoretical basis for recently proposed experiments to test quantum effects in gravity, achieving the remarkable result that such experiments, if performed successfully, would rule out all …

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Quantum information and the arrow of time

Quantum information and the arrow of time. Andrea Di Biagio (QISS Rome), Pietro Donà, Carlo Rovelli (QISS Marseille)  pre-published at  Popular Summary: Standard formulations of quantum mechanics feature two distinct laws describing how the state of a quantum system changes in time. The first law, the Schrödinger equation, is smooth and time-reversal symmetric. By looking …

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