In a dephased long-range XXZ chain, the SU(2)-symmetric ground state relaxes universally as e^{-2t} because its overlap with slower modes vanishes, yielding a strong quantum Mpemba effect.
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Symmetry-Induced Relaxation Comb and Strong Quantum Mpemba Effect in Long-Range XXZ Spin Chains
In a dephased long-range XXZ chain, the SU(2)-symmetric ground state relaxes universally as e^{-2t} because its overlap with slower modes vanishes, yielding a strong quantum Mpemba effect.