From Analytic Structure to Quantum Complexity: Walsh-Pauli Representations of Continuum Operators

Abstract:How does continuum operator structure appear in a finite qubit register? We address this question for analytic functions of diagonal operators represented in a binary basis, focusing on the Jordan--Lee--Preskill (JLP) momentum operator, by developing an operator-level generating-function framework for their Walsh-Pauli spectra. The construction determines the spectrum analytically and reveals exact support and parity selection rules, together with a nontrivial intra-shell hierarchy induced by the binary encoding. This provides a systematic characterization of Walsh compressibility and its relation to Pauli locality. As a controlled application, we consider generalized uncertainty-principle (GUP) kinematics as a tunable nonlinear odd deformation of momentum, showing how higher-order momentum terms redistribute spectral weight into progressively higher Pauli-weight sectors

arXiv:2609.11350 [quant-ph]

(or arXiv:2609.11350v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.11350 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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