arXiv:2512.21478quant-phcs.LG2025-12

提出两种量子化非下采样小波变换方法,实现多尺度信号处理的稳定性与平移不变性。

Quantum Nondecimated Wavelet Transform: Theory, Circuits, and Applications

  • 用量子寄存器并行实现所有循环移位的小波变换
  • 支持相干后处理,如通过辅助比特实现量子收缩
  • 适合需要多尺度分析的量子信号处理任务

非下采样小波变换(NDWT)是经典多尺度信号分析的核心工具,以其稳定性、冗余性和平移不变性著称。本文提出了两种互补的量子化NDWT形式。第一种基于epsilon-下采样解释,将移位索引量子化为量子寄存器,通过受控循环移位和小波分析酉操作,同时实现所有循环移位的小波变换,得到显式的全酉量子表示,支持相干后处理,包括通过辅助比特驱动的完全正定保迹映射实现量子收缩。第二种基于Hadamard测试,利用对角相位算子通过干涉探测尺度-移位小波结构,直接获得平移不变的能量小波图谱和多尺度频谱,无需显式重构系数。两种方法共同证明,冗余和平移不变性可在量子设置中被充分利用而非规避。在去噪、特征提取和频谱标度中的应用表明,量子NDWT为多尺度量子信号处理提供了灵活且物理意义明确的基础。

原文摘要 · Abstract (English)

The nondecimated or translation-invariant wavelet transform (NDWT) is a central tool in classical multiscale signal analysis, valued for its stability, redundancy, and shift invariance. This paper develops two complementary quantum formulations of the NDWT that embed these classical properties coherently into quantum computation. The first formulation is based on the epsilon-decimated interpretation of the NDWT and realizes all circularly shifted wavelet transforms simultaneously by promoting the shift index to a quantum register and applying controlled circular shifts followed by a wavelet analysis unitary. The resulting construction yields an explicit, fully unitary quantum representation of redundant wavelet coefficients and supports coherent postprocessing, including quantum shrinkage via ancilla-driven completely positive trace preserving maps. The second formulation is based on the Hadamard test and uses diagonal phase operators to probe scale-shift wavelet structure through interference, providing direct access to shift-invariant energy scalograms and multiscale spectra without explicit coefficient reconstruction. Together, these two approaches demonstrate that redundancy and translation invariance can be exploited rather than avoided in the quantum setting. Applications to denoising, feature extraction, and spectral scaling illustrate how quantum NDWTs provide a flexible and physically meaningful foundation for multiscale quantum signal processing.

小波变换量子计算信号处理

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