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arXiv 2202.00634quant-ph
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高斯玻色子位移采样的实验演示

Experimental demonstration of Gaussian boson sampling with displacement

G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley

摘要:

高斯玻色子采样(GBS)是一种从高维非经典压缩态的光子数分布中抽取样本的量子采样任务。为了使这一任务对经典计算机来说变得棘手,建造GBS机器的实验主要集中在增加非经典光的维度和压缩强度上。然而,还没有实验证明的能力,以取代压缩状态在相空间中,这是一般需要的GBS的实际应用。在这项工作中,我们建立了一个GBS机器,通过注入一个激光束旁边的双模压缩真空状态到一个15模式的干涉仪实现的位移。我们专注于两项新功能。首先,我们利用位移在干涉仪输出端重建多模高斯态。我们的重建技术是在原位,只需要三个测量设置,无论状态的尺寸。其次,我们研究了在我们的GBS机器中加入经典激光如何影响采样其输出光子统计的复杂性。我们介绍和验证近似的半经典模型,当检测到的光的一个显着的部分是经典的,降低了计算成本。

英文摘要:

Gaussian boson sampling (GBS) is quantum sampling task in which one has to draw samples from the photon-number distribution of a large-dimensional nonclassical squeezed state of light. In an effort to make this task intractable for a classical computer, experiments building GBS machines have mainly focused on increasing the dimensionality and squeezing strength of the nonclassical light. However, no experiment has yet demonstrated the ability to displace the squeezed state in phase-space, which is generally required for practical applications of GBS. In this work, we build a GBS machine which achieves the displacement by injecting a laser beam alongside a two-mode squeezed vacuum state into a 15-mode interferometer. We focus on two new capabilities. Firstly, we use the displacement to reconstruct the multimode Gaussian state at the output of the interferometer. Our reconstruction technique is in situ and requires only three measurements settings regardless of the state dimension. Secondly, we study how the addition of classical laser light in our GBS machine affects the complexity of sampling its output photon statistics. We introduce and validate approximate semi-classical models which reduce the computational cost when a significant fraction of the detected light is classical.

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