Author

Antonio Acín

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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

Observable-targeted variational quantum simulation of Hamiltonian dynamics

Standard variational quantum simulation seeks to reproduce the evolution of the full quantum state, although many applications require only the expectation values of a few observables. We study a variational method for pure-state Hamiltonian dynamics that updates circuit parameters to reproduce the evolution of selecte...

Leonardo Zambrano, L. Pereira, Antonio Acín · 0 citations

Preprint Jul 2026

Rigorous Time-dependent Hamiltonian Learning via Continuous Weak Measurements

Characterizing the Hamiltonian that a quantum processor actually implements is central to calibrating and validating current quantum hardware. Many devices, however, operate with generators that are time dependent by design. Here we develop a rigorous and experimentally friendly protocol for learning time-dependent man...

Jesús Jiménez-Rodríguez, Giacomo Franceschetto, Antonio Ac'in et al. · 0 citations