Universal long-time behavior of the quantum Fisher information in dynamical quantum phase transitions
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.
Fields of Study & Subjects
Quantum many-body systems
Advanced Thermodynamics and Statistical Mechanics
Quantum Information and Cryptography
Publication details
- Journal / source
- Physical Review A
- Volume
- 113
- Issue
- 3
- Publication date
- 3 February 2026
- Language
- EN