Dynamical quantum phase transition with singular multipartite entanglement

Abstract:We investigate the nonequilibrium quench dynamics of the one-dimensional transverse-field Ising model in both integrable and nonintegrable regimes. In particular, we report on a novel type of dynamical quantum phase transition (DQPT) that is characterized by a singular multipartite entanglement signature occurring at critical times in the post-quench dynamics. We show that this behavior is fundamentally distinct from previously studied DQPTs characterized by a nonanalytic rate function. We quantify the multipartite entanglement of the state by the quantum Fisher information and demonstrate that the DQPT belongs to a different universality class than the ground-state phase transition. Furthermore, we perform a spectral analysis of the DQPT and demonstrate that it is a genuine nonequilibrium transition arising from the constructive interference of excited states of the system during the many-body dynamics. Finally, we discuss potential experimental realizations in Rydberg platforms as well as applications in the context of quantum metrology.

Quantum Physics (quant-ph); Quantum Gases (cond-mat.quant-gas)

arXiv:2506.13898 [quant-ph]

(or arXiv:2506.13898v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2506.13898 Focus to learn more arXiv-issued DOI via DataCite

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