Entanglement scaling transitions in chaotic quantum systems

Researchers from Princeton University, the University of Geneva, the National University of Singapore, and other institutions have identified a transition in how temporal entanglement scales within chaotic quantum systems. The work reconciles a recent argument by Foligno et al. that temporal entanglement in chaotic one-dimensional quantum circuits scales linearly with evolution time, suggesting unexpectedly high complexity, with the observed rapid thermalization of local observables. By exactly solving a random-unitary bath model, the team found a regime where temporal entanglement is extensive, yet contained within complex temporal correlations that…