Work

Measuring temporal entropies in experiments

Year: 2026

Type: article

Abstract: We propose an experimental protocol to measure generalized temporal entropies in many-body quantum systems. Our approach involves using local operators as probes to characterize the out-of-equilibrium dynamics induced by a geometric double quench on a replicated system. Such protocol mimics the path integral on the corresponding Riemann surface encoding generalized temporal entanglement. We present the results of tensor network simulations of one-dimensional systems that validate the protocol and demonstrate the experimental feasibility of measuring generalized temporal entropies, and we outline the experimental requirements for implementing these quenches using state-of-the-art quantum simulators. Therefore, our results provide a physical interpretation of the meaning of generalized temporal entropies. Furthermore, they reveal that the dynamics induced on two replicas of the Ising model in a transverse field differ qualitatively from those of its nonintegrable extension, suggesting that generalized temporal entropies can be used as a tool for identifying different dynamical classes in quantum systems.

Source: Physical Review Research

DOI: 10.1103/436b-cnh8

Authors: Aleix Bou-Comas, Carlos Ramos Marimón, Jan T. Schneider, Stefano Carignano, Luca Tagliacozzo

Institutions: Consejo Superior de Investigaciones Científicas, Instituto de Física Fundamental, Institut de Ciències del Cosmos, Universitat de Barcelona, Barcelona Supercomputing Center

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funders: European Commission, Agencia Estatal de Investigación