2026-10-21 · arXiv Quantum Physics
arXiv:2610.08299v2 Announce Type: replace
Abstract: Pauli decomposition of an $n$-qubit operator is expensive if each of the $4^n$ Pauli strings is treated as an unstructured object. Labeling those strings by the configuration space $(\mathbb{Z}_2)^n$ makes them displacement operators $X^{\otimes x}Z^{\otimes z}$ on the computational space: shifts by~$x$ and multiplications by characters $Z^{\otimes z}$ in the computational basis. That labeling organizes the operator into $2^n$ fibers of length $2^n$, one per shift~$x$, each collecting the computational-basis amplitudes that hop by~$x$. Expanding each fiber function in the character basis of $(\mathbb{Z}_2)^n$ --- a length-$2^n$ Walsh--Hadamard transform --- recovers the Pauli coefficients at total cost $O(n\cdot4^n)$. The same fiber / shift--character picture extends to $(\mathbb{Z}_p)^n$ (Heisenberg--Weyl qudits). \texttt{paulikit} is a memory-bounded realization for qubits: for matrix-sparse inputs, peak memory need not densify to a full $2^n\times2^n$ operator. Performance is checked on a stated low-end GNU/Linux platform for a coupled-oscillator sweep beyond a billion Pauli terms.
原文链接：https://arxiv.org/abs/2610.08299
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