Benchmarking of Gaussian boson sampling using two-point correlators
Benchmarking of Gaussian boson sampling using two-point correlators
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DOI：
10.1103/physreva.99.023836
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发表时间：
2018-07
影响因子：
2.9
通讯作者：
D. Phillips;M. Walschaers;J. Renema;I. Walmsley;N. Treps;J. Sperling
中科院分区：
文献类型：
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作者：
D. Phillips;M. Walschaers;J. Renema;I. Walmsley;N. Treps;J. Sperling
高斯玻色子采样是一种很有前途的方案，可以使用实验室中可以访问的光子态来演示量子计算优势，从而提供可伸缩的量子光源。在这一贡献中，我们研究了两点光子数关联函数，以深入了解高斯态在光网络中的干涉。我们研究了统计特征的特征，这些特征使我们能够区分经典干涉和量子干涉。与玻色子采样的典型实现相比，我们发现了对所研究的相关器的额外贡献，这些贡献源于高斯态的相位相关性，并且在Fock态干涉时是不可观察到的。利用前三个矩，我们制定了仅使用两个输出来实验观察高斯态的量子干涉特征所需的工具。通过考虑现实实验中当前的结构限制，我们进一步表明，即使在存在损耗、噪声和有限光子数分辨率的情况下，量子干涉和经典干涉之间的统计显著区别也是可能的。因此，我们制定并应用了一个理论框架来衡量现实条件下高斯玻色子采样的量子特征。
Gaussian boson sampling is a promising scheme for demonstrating a quantum computational advantage using photonic states that are accessible in a laboratory and, thus, offer scalable sources of quantum light. In this contribution, we study two-point photon-number correlation functions to gain insight into the interference of Gaussian states in optical networks. We investigate the characteristic features of statistical signatures which enable us to distinguish classical from quantum interference. In contrast to the typical implementation of boson sampling, we find additional contributions to the correlators under study which stem from the phase dependence of Gaussian states and which are not observable when Fock states interfere. Using the first three moments, we formulate the tools required to experimentally observe signatures of quantum interference of Gaussian states using two outputs only. By considering the current architectural limitations in realistic experiments, we further show that a statistically significant discrimination between quantum and classical interference is possible even in the presence of loss, noise, and a finite photon-number resolution. Therefore, we formulate and apply a theoretical framework to benchmark the quantum features of Gaussian boson sampling under realistic conditions.