arXiv:2410.05777quant-phcs.AI2024-10

提出融合编码与量化的新方法,提升量子卷积网络效率。

Integrated Encoding and Quantization to Enhance Quanvolutional Neural Networks

  • 引入可记忆的灵活量化策略,支持多级量化以平衡信息保留与资源消耗。
  • 设计集成编码电路,将编码与处理合并,减少量子资源占用。
  • 在分类任务中表现优于或媲美传统模型,更适合当前量子硬件。

图像处理是量子机器学习最具前景的应用之一。无训练参数的量子卷积神经网络是当前及未来近中期量子设备上的首选方案。典型量子卷积层输入预处理流程包含四步:可选的输入二值量化、经典数据编码为量子态、数据处理得到最终量子态、将量子态解码回经典输出。本文提出两种增强量子卷积模型效率的方法:首先,提出一种具有记忆功能的灵活数据量化方法,适用于任意编码方式,可自由调整量化级别以保留更多信息或降低电路执行次数;其次,引入一种新的集成编码策略,将编码与处理步骤合并于单一量子电路中,实现对量子比特数、滤波器大小和电路深度等架构参数的高度灵活性,便于适配量子硬件需求。我们在两个不同的分类任务上,将所提模型与经典卷积神经网络及著名的旋转编码方法进行了对比。结果表明,所提模型在性能上达到或超过其他方法,同时所需量子资源显著减少。

原文摘要 · Abstract (English)

Image processing is one of the most promising applications for quantum machine learning (QML). Quanvolutional Neural Networks with non-trainable parameters are the preferred solution to run on current and near future quantum devices. The typical input preprocessing pipeline for quanvolutional layers comprises of four steps: optional input binary quantization, encoding classical data into quantum states, processing the data to obtain the final quantum states, decoding quantum states back to classical outputs. In this paper we propose two ways to enhance the efficiency of quanvolutional models. First, we propose a flexible data quantization approach with memoization, applicable to any encoding method. This allows us to increase the number of quantization levels to retain more information or lower them to reduce the amount of circuit executions. Second, we introduce a new integrated encoding strategy, which combines the encoding and processing steps in a single circuit. This method allows great flexibility on several architectural parameters (e.g., number of qubits, filter size, and circuit depth) making them adjustable to quantum hardware requirements. We compare our proposed integrated model with a classical convolutional neural network and the well-known rotational encoding method, on two different classification tasks. The results demonstrate that our proposed model encoding exhibits a comparable or superior performance to the other models while requiring fewer quantum resources.

量子机器学习量子神经网络编码优化量化

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