Universal Long-Time Behavior of the Quantum Fisher Information in Dynamical Quantum Phase Transitions
Quantum Physics
2025-07-09 v1 Quantum Gases
Abstract
We investigate dynamical quantum phase transitions (DQPTs) in quantum systems that possess well-defined classical limits, focusing on the spinor Bose-Einstein condensate and the Lipkin-Meshkov-Glick model. We diagnose the DQPTs with the long-time average of the quantum Fisher information (QFI) showing that it abruptly changes at the transition point. Using mean-field and semiclassical approximations, we demonstrate that the long-time average of the QFI reveals universal behavior that persists across different systems.
Keywords
Cite
@article{arxiv.2507.05579,
title = {Universal Long-Time Behavior of the Quantum Fisher Information in Dynamical Quantum Phase Transitions},
author = {J. Mumford and R. J. Lewis-Swan},
journal= {arXiv preprint arXiv:2507.05579},
year = {2025}
}
Comments
10 pages, 4 figures