Author

Kyrylo Simonov

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Preprint Sep 2026

What makes a causal loop consistent?

Causal loops escape paradoxes if they generate valid probabilities under arbitrary independent local interventions. We show that a deterministic classical process is logically consistent if and only if it contains no signaling loops: cyclic signaling is forbidden but cyclic causation is not, allowing indefinite causal...

Hippolyte Dourdent, Andreas Leitherer, Emanuel-Cristian Boghiu et al. · 0 citations

Preprint Sep 2026

Higher-order quantum thermodynamics: equilibrium and causal structure

Quantum thermodynamics is traditionally formulated as a theory of equilibrium states and state transformations. Recent advances in higher-order quantum transformations, which describe physical scenarios beyond states and channels and provide a systematic framework for causal order, raise the question of how equilibrium...

S. Milz, Kyrylo Simonov, Z. Zimborás et al. · 0 citations

Preprint Aug 2026

Experimental Quantum Key Distribution in an Indefinite Causal Order

An experimental implementation of a BB84-like quantum cryptography by placing Alice and Bob's measurement-and-preparation operations in a photonic quantum SWITCH, which provides a proof of principle that indefinite causal order can be exploited to detect eavesdropping without sacrificing key bits.

Yann Valibouse, Mart'i Cladera-Rossell'o, Michael Antesberger et al. · 0 citations