Emergent Causality in Large Dimensions

by Carl Erik Hugo Fernström (KTH)

Thursday 4 Sept 2025, 13:00 → 14:00 Europe/Stockholm

Albano 3: 5230 - Xenon (12 seats) (Albano Building 3)

We investigate the emergence of causality in high-dimensional quantum systems through the study of signaling behavior induced by Haar-random complete orthogonal measurement superoperators (COMS). By defining distance-based measures of signaling we compute the Haar-expected signaling of COMS in bipartite settings. Monte Carlo simulations reveal robust power-law suppression of signaling as subsystem dimensions increase. These results provide quantitative evidence that nonlocal operations, though formally capable of faster-than-light signaling, become effectively causal with high probability in the macroscopic limit.