Related papers: Exact strong zero modes in quantum circuits and spin chains with non-diagonal boundary conditions

Exact strong zero modes in quantum circuits and spin chains with non-diagonal boundary conditions

URL: http://arxiv.org/abs/2511.05490v2
Date: Mon, 10 Nov 2025 12:50:33 GMT
Title: Exact strong zero modes in quantum circuits and spin chains with non-diagonal boundary conditions
Authors: Sascha Gehrmann, Fabian H. L. Essler,
Abstract summary: We construct exact strong zero mode operators (ESZM) in integrable quantum circuits and the spin-1/2 XXZ chain for general open boundary conditions.<n>We show that the ESZM is localized around one of the boundaries and induces infinite boundary coherence times.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We construct exact strong zero mode operators (ESZM) in integrable quantum circuits and the spin-1/2 XXZ chain for general open boundary conditions, which break the bulk U(1) symmetry of the time evolution operators. We show that the ESZM is localized around one of the boundaries and induces infinite boundary coherence times. Finally, we prove that the ESZM becomes spatially non-local under the map that relates the spin-1/2 XXZ chain to the asymmetric simple exclusion process, which suggests that it does not play a significant role in the dynamics of the latter.

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