One cut, two parities: exact Fibonacci charge responses in the golden chain

Abstract:We determine the exact cut-charge Born law in the ground state of every periodic antiferromagnetic golden chain with at least three sites. Its two parity branches retain different information. At even length, the ratio of nontrivial to vacuum probabilities equals the squared Fibonacci quantum dimension. The odd vacuum probability equals the even-branch nontrivial probability times one ground-state Born coordinate, while normalization fixes the complement. Parity selects the positive hoop sector at even length and the complementary sector at odd length. At each length, the corresponding cut projector compresses to a scalar in the even sector or to a non-scalar element of a two-character algebra in the odd sector. The unchanged measurement rule yields categorical rigidity at even length and one-coordinate state sensitivity at odd length.

35 pages; code available at Zenodo, version 2.0.0: this https URL

arXiv:2607.01151 [quant-ph]

(or arXiv:2607.01151v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.01151 Focus to learn more arXiv-issued DOI via DataCite

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