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The quantum XXZ spin model with alternating bond strengths under magneticfield has a rich equilibrium phase diagram which includes Haldane, Luttingerliquid, singlet, and paramagnetic phases. We show that the nearest neighborbipartite and multipartite entanglement can detect quantum critical lines andphases in this model. We determine a region in parameter space in which thedynamical states, starting from the ground state of the Haldane (dimer) phasecan create highly multipartite entangled states for any time period, therebyestablishing it as a potential candidate for the implementation of quantuminformation tasks. We also exhibit that if the initial and evolved states arein two different phases, the nonanalytic behavior of multipartite entanglementand the rate function based on Loschmidt echo can signal quantum phasetransition happened at zero temperature. In a similar spirit, we report thatfrom the product state, the patterns of block entanglement entropy of theevolved state with time can also infer the phase transition at equilibrium.

Predicting Critical Phases from Entanglement Dynamics in XXZ Alternating Chain