Measuring unconventional causal structures in monitored dynamics
Published in arXiv preprint, 2026
This paper studies causal structure in monitored quantum dynamics, where measurements and post-selection can generate behavior that differs sharply from classical relativistic intuition. It introduces cross-entropy quantum causal influence as a measurable diagnostic of state-dependent causal structure, demonstrates exotic effects such as inverted light cones, and analyzes the relation between time arrow and entropy in analytically tractable models.
Preprint: arXiv:2601.12271
Recommended citation: Hong-Yi Wang, Haifeng Tang, and Xiao-Liang Qi. "Measuring unconventional causal structures in monitored dynamics." arXiv:2601.12271 (2026).
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