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On extendibility of additive code isometries

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arxiv 1406.1714 v2 pith:PH2OAQPU submitted 2014-06-06 math.CO

On extendibility of additive code isometries

classification math.CO
keywords codelinearadditivecodesextensionisometriesisometrylength
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For linear codes, the MacWilliams Extension Theorem states that each linear isometry of a linear code extends to a linear isometry of the whole space. But, in general, it is not the situation for nonlinear codes. In this paper it is proved, that if the length of an additive code is less than some threshold value, then an analogue of the MacWilliams Extension Theorem holds. One family of unextendible code isometries for the threshold value of code length is described.

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  1. Minimal Counterexamples of the MacWilliams Extension Theorem for Stabilizer Codes

    quant-ph 2026-07 conditional novelty 6.0

    The MacWilliams extension theorem fails for stabilizer codes at every qudit dimension; for qubits the minimal counterexample lives at length 3 and is essentially unique, with minimal full-support counterexamples at le...