Thermalization time in a boundary-coupled 1D chain with approximate pair-flip constraints scales exponentially with system size due to configuration-space bottlenecks.
We let O(t) ≡ E Ct [Ct(O)] (D4) denote the circuit-averaged evolution of O over time t, where the ECt denotes averaging over the unitaries constituting U
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Exponentially slow thermalization and the robustness of Hilbert space fragmentation
Thermalization time in a boundary-coupled 1D chain with approximate pair-flip constraints scales exponentially with system size due to configuration-space bottlenecks.