Author

Esteban Castro-Ruiz

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Preprint Aug 2026

Compositionality in quantum reference frame perspectives

Understanding a composite system through its constituents is a fundamental practice in physics. In the context of quantum reference frames (QRFs), however, combining the usual quantum-theoretic notion of composition with QRF perspectives gives rise to subtle issues, such as the'paradox of the third particle'. Here we s...

Bruna Sahdo, Esteban Castro-Ruiz · 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

Preprint Jul 2026

Quantum incompatibility of Born probabilities

Quantum theory challenges the view that individual measurement outcomes are predefined and independent of the measurement context. Yet the quantum state itself -- the catalogue of probabilities for all possible measurements -- is usually assumed to be well defined. We argue that this assumption tacitly relies on measur...

Esteban Castro-Ruiz, Nathan Cohen, L. Barbado et al. · 0 citations