用量子电路生成潜在向量,探索量子增强生成对抗网络的可行性
Quantum-Enhanced Generative Adversarial Networks: Comparative Analysis of Classical and Hybrid Quantum-Classical Generative Adversarial Networks
- 用量子线路生成潜变量,与经典判别器配合构建混合量子-经典GAN
- 7比特量子模型在后期训练中性能逼近经典GAN,3比特模型过早收敛
- 在当前噪声量子硬件下,量子采样代价可控,适合研究量子生成建模
生成对抗网络(GAN)在生成高质量数据样本方面表现出强大能力,但其性能受限于从经典噪声分布采样的潜在表示质量。本研究探讨了混合量子-经典生成对抗网络(HQCGAN),其中量子生成器通过参数化量子线路生成经典判别器使用的潜在向量。我们对比了经典GAN与三种分别含3、5、7个量子比特的HQCGAN变体,使用Qiskit的AerSimulator结合真实噪声模型模拟近期内量子设备。实验基于二值化MNIST数据集(仅0和1),以匹配当前量子硬件的低维潜在空间。所有模型训练150轮,采用弗雷谢起始距离(FID)和核起始距离(KID)评估。结果显示,尽管经典GAN表现最优,7比特HQCGAN在后期训练中性能显著提升,差距缩小;而3比特模型则存在早期收敛限制。效率分析表明,尽管有量子采样开销,训练时间增幅有限。这些发现验证了噪声量子电路作为潜在先验在GAN架构中的可行性,凸显其在噪声中等规模量子(NISQ)时代增强生成建模的潜力。
原文摘要 · Abstract (English)
Generative adversarial networks (GANs) have emerged as a powerful paradigm for producing high-fidelity data samples, yet their performance is constrained by the quality of latent representations, typically sampled from classical noise distributions. This study investigates hybrid quantum-classical GANs (HQCGANs) in which a quantum generator, implemented via parameterised quantum circuits, produces latent vectors for a classical discriminator. We evaluate a classical GAN alongside three HQCGAN variants with 3, 5, and 7 qubits, using Qiskit's AerSimulator with realistic noise models to emulate near-term quantum devices. The binary MNIST dataset (digits 0 and 1) is used to align with the low-dimensional latent spaces imposed by current quantum hardware. Models are trained for 150 epochs and assessed with Frechet Inception Distance (FID) and Kernel Inception Distance (KID). Results show that while the classical GAN achieved the best scores, the 7-qubit HQCGAN produced competitive performance, narrowing the gap in later epochs, whereas the 3-qubit model exhibited earlier convergence limitations. Efficiency analysis indicates only moderate training time increases despite quantum sampling overhead. These findings validate the feasibility of noisy quantum circuits as latent priors in GAN architectures, highlighting their potential to enhance generative modelling within the constraints of the noisy intermediate-scale quantum (NISQ) era.
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