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Researchers at SISSA and ENS Paris-Saclay have identified a quantum Mpemba effect within transverse-field Ising models, demonstrating that states further from equilibrium can restore Kramers-Wannier symmetry more rapidly than those closer to it. By introducing the Kramers-Wannier entanglement asymmetry as a diagnostic tool, this study reveals how non-invertible symmetries dynamically recover in quantum many-body systems away from criticality. These findings advance fundamental understanding of nonequilibrium dynamics and duality restoration mechanisms essential for theoretical quantum computing research.

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SISSA/ENS Researchers Find Quantum Mpemba Effect in Ising Models

Quantum ZeitgeistJuly 24, 20264 min read

SISSA/ENS researchers found a quantum Mpemba effect in Ising models, revealing states farther from equilibrium can restore Kramers-Wannier symmetry faster.

Researchers at SISSA and ENS Paris-Saclay have introduced a new quantum-information measure, the Kramers-Wannier entanglement asymmetry, and found it exhibits a striking crossover between the ordered and disordered phases, together with a pronounced dip at the critical point in the transverse-field Ising chain. This dip becomes increasingly sharp as the subsystem size grows. Their work, focused on the behavior of the Kramers-Wannier duality away from criticality and out of equilibrium, reveals a quantum Mpemba effect where states initially farther from…

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