Universal Long-Time Behavior of the Quantum Fisher Information in Dynamical Quantum Phase Transitions

• URL: http://arxiv.org/abs/2507.05579v1
• Date: Tue, 08 Jul 2025 01:32:39 GMT
• Title: Universal Long-Time Behavior of the Quantum Fisher Information in Dynamical Quantum Phase Transitions
• Authors: J. Mumford, R. J. Lewis-Swan,
• Abstract summary: We investigate quantum dynamical phase transitions (DQPTs) in quantum systems that possess well-defined classical limits.<n>We show that the long-time average of the quantum Fisher information (QFI) shows that it abruptly changes at the transition point.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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