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quant-ph2026
Quantum Permutations and Beyond Quantum Controlled Reference Frames
Ofek Bengyat, Časlav Brukner, Marios Christodoulou
Quantum permutations, or magic unitaries, have in recent years been explored in the context of identifying `genuinely quantum' isometries of graphs. Here, we import this tool in ph…
quant-ph2026
An Operational Resolution of the Third-Particle Paradox
Časlav Brukner, Esteban Castro-Ruiz, Marius Krumm
We give an operational resolution of the third-particle paradox, relevant in the theory of quantum reference frames. The apparent paradox is that a system which is irrelevant in on…
quant-ph2026
Schroedinger's Equation at 100: The Wave Picture That Helped and Possibly Hurt
Caslav Brukner
Schroedinger's equation gave early quantum theory a visual language that looked like physics again: a wave evolving by a linear differential equation. This essay argues that the sa…