Related papers: Dynamics of quantum Fisher and Wigner-Yanase skew information following a noisy quench

Dynamics of quantum Fisher and Wigner-Yanase skew information following a noisy quench

URL: http://arxiv.org/abs/2507.09659v2
Date: Sun, 20 Jul 2025 18:17:40 GMT
Title: Dynamics of quantum Fisher and Wigner-Yanase skew information following a noisy quench
Authors: J. Naji, R. Jafari, Alireza Akbari, M. Abdi,
Abstract summary: We study the influence of noise on the dynamics of a transverse field Ising model when quenched across a quantum critical point.<n>We employ the quantum Fisher information (QFI) and Wigner-Yanase skew information ( WYSI) as measures of quantum coherence.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We study the influence of noise on the dynamics of a transverse field Ising model when quenched across a quantum critical point. To quantify two-spin correlations properties, we employ the quantum Fisher information (QFI) and Wigner-Yanase skew information (WYSI) as measures of quantum coherence. In the absence of noise, despite the entanglement, both QFI and WYSI increase monotonically with the ramp quench time, approaching their adiabatic limits without exhibiting any Kibble-Zurek type scaling with quench duration. When noise is added to the quench protocol, the coherence dynamics change dramatically: QFI and WYSI both decay exponentially with time scale of a ramp quench, with the exponent depending on the noise intensity. Furthermore, the maximum ramp time, at which either of these measures reach their maximum, scales linearly with the noise variance, featuring the same exponent that determines the optimal annealing time for minimizing defect production in noisy quantum annealing.

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