Author

Č. Brukner

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Preprint Aug 2026

Quantum Permutations and Beyond Quantum Controlled Reference Frames

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 physics, showing that quantum permutations yield a generalisation of quantum reference frames in a discrete setting that is reminiscent of the...

Ofek Bengyat, Č. Brukner, M. Christodoulou · 0 citations

Preprint Jul 2026

An Operational Resolution of the Third-Particle Paradox

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 one quantum-reference-frame description can seem to become relevant after changing to another quantum reference frame, because the reduced sta...

Č. Brukner, Esteban Castro-Ruiz, Marius Krumm · 1 citation