Exact closed-form size-independent expressions for von Neumann and Rényi entanglement entropies plus Loschmidt echoes are obtained for quench dynamics in the staggered XXZ antiferromagnetic chain in the flat-band limit, validated by IBM-Q simulations.
Lenihan, et al, Excitation Amplitude Sampling for Low Variance Electronic Structure on Quantum Computers, arXiv:2506.15438 (2025)
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Quench dynamics of the quantum XXZ chain with staggered interactions: Exact results and simulations on digital quantum computers
Exact closed-form size-independent expressions for von Neumann and Rényi entanglement entropies plus Loschmidt echoes are obtained for quench dynamics in the staggered XXZ antiferromagnetic chain in the flat-band limit, validated by IBM-Q simulations.