用量子电路提升分子模拟精度,实现近似量子优势。
Hybrid Quantum--Classical Machine Learning Potential with Variational Quantum Circuits
- 将量子电路嵌入经典消息传递网络的读出层
- 在高温液态硅模拟中复现了高精度结构与热力学性质
- 为当前量子硬件提供可实现的材料建模优势
量子算法在模拟大规模复杂分子系统方面仍处于初级阶段,超越现有经典方法的目标始终未能实现。在此背景下,混合量子-经典算法成为有前景的研究方向:将传统神经网络与运行在当前噪声中等规模量子(NISQ)硬件上的变分量子电路(VQC)结合。此类混合架构适配于NISQ硬件——经典处理器承担主要计算,量子处理器执行特定子任务以引入额外非线性与表达能力。本文对比了纯经典E(3)-等变消息传递机器学习势(MLP)与一种混合量子-经典MLP在预测液态硅密度泛函理论(DFT)性质上的表现。在混合架构中,消息传递层的每个读出均替换为一个VQC。基于该混合量子-经典机器学习势(HQC-MLP)驱动的分子动力学模拟表明,使用VQC即可准确再现高温下的结构与热力学性质。结果证明,在材料建模领域,当前可实现的混合量子算法已能带来可衡量的优势,为近期实现量子优势提供可行路径。
原文摘要 · Abstract (English)
Quantum algorithms for simulating large and complex molecular systems are still in their infancy, and surpassing state-of-the-art classical techniques remains an ever-receding goal post. A promising avenue of inquiry in the meanwhile is to seek practical advantages through hybrid quantum-classical algorithms, which combine conventional neural networks with variational quantum circuits (VQCs) running on today's noisy intermediate-scale quantum (NISQ) hardware. Such hybrids are well suited to NISQ hardware. The classical processor performs the bulk of the computation, while the quantum processor executes targeted sub-tasks that supply additional non-linearity and expressivity. Here, we benchmark a purely classical E(3)-equivariant message-passing machine learning potential (MLP) against a hybrid quantum-classical MLP for predicting density functional theory (DFT) properties of liquid silicon. In our hybrid architecture, every readout in the message-passing layers is replaced by a VQC. Molecular dynamics simulations driven by the HQC-MLP reveal that an accurate reproduction of high-temperature structural and thermodynamic properties is achieved with VQCs. These findings demonstrate a concrete scenario in which NISQ-compatible HQC algorithm could deliver a measurable benefit over the best available classical alternative, suggesting a viable pathway toward near-term quantum advantage in materials modeling.
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