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quant-ph2026
Minimal nonintegrable models with three-site interactions
Wen-Ming Fan, Kun Hao, Xiao-Hui Wang +3
We study integrability breaking in translationally invariant spin- chains with genuine three-site interactions. Using a two-qubit composite representation, we prove that the d…
quant-ph2025
Absence of local conserved charges of the Fredkin spin chain and its truncated versions
Wen-Ming Fan, Kun Hao, Yang-Yang Chen +3
Conservation laws serve as the hallmark of integrability. The absence of conserved charges typically implies that the model is nonintegrable. The recently proposed Fredkin spin cha…
quant-ph2024
Geometric representations of braid and Yang-Baxter gates
Kun Zhang, Kun Hao, Kwangmin Yu +2
Brick-wall circuits composed of the Yang-Baxter gates are integrable. It becomes an important tool to study the quantum many-body system out of equilibrium. To put the Yang-Baxter…