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arXiv 2004.04770quant-ph
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训练高斯玻色子抽样分布

Training Gaussian Boson Sampling Distributions

Leonardo Banchi, Nicolás Quesada, Juan Miguel Arrazola

摘要:

高斯玻色子采样(GBS)是光子量子计算的近期平台。已经开发了依赖于直接编程GBS设备的应用,但是训练和优化电路的能力一直是开发新算法的关键缺失成分。在这项工作中,我们推导出GBS分布的解析梯度公式,该公式可用于使用基于梯度下降的标准方法来训练设备。我们引入了一个参数化的分布,允许梯度估计采样从同一设备,正在优化。在使用Kullback-Leibler发散或对数似然代价函数进行训练的情况下,我们证明了可以经典地计算梯度,从而实现快速训练。我们用随机优化和无监督学习中的数值实验来说明这些结果。作为一个特殊的例子,我们介绍了变分伊辛求解器,一种混合算法,用于训练GBS设备以高概率对经典伊辛模型的基态进行采样。

英文摘要:

Gaussian Boson Sampling (GBS) is a near-term platform for photonic quantum computing. Applications have been developed which rely on directly programming GBS devices, but the ability to train and optimize circuits has been a key missing ingredient for developing new algorithms. In this work, we derive analytical gradient formulas for the GBS distribution, which can be used to train devices using standard methods based on gradient descent. We introduce a parametrization of the distribution that allows the gradient to be estimated by sampling from the same device that is being optimized. In the case of training using a Kullback-Leibler divergence or log-likelihood cost function, we show that gradients can be computed classically, leading to fast training. We illustrate these results with numerical experiments in stochastic optimization and unsupervised learning. As a particular example, we introduce the variational Ising solver, a hybrid algorithm for training GBS devices to sample ground states of a classical Ising model with high probability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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