论文标题

非线性玻色子采样的经典模拟性的噪声阈值

Noise thresholds for classical simulability of non-linear Boson sampling

论文作者

Bressanini, Gabriele, Kwon, Hyukjoon, Kim, M. S.

论文摘要

Boson采样是一种计算问题,可以在经典的机器上模拟很难模拟,它是使用玻色子进行量子优势的实验证明的有前途的候选人。但是,不可避免的实验噪声和缺陷,例如干涉仪中的损失和检测器的随机计数,可能会从进入量子优势的制度中挑战采样任务。在这项工作中,我们引入了高阶非线性,以提高问题的计算复杂性和协议对噪声的鲁棒性,即增加噪声阈值,从而可以对问题进行有效的经典模拟。使用基于相关准概率分布的负量的相位方法,我们建立了必要的非经典性条件,任何实验量子优势都必须满足任何实验性证明。我们的结果表明,在输入状态制备水平上添加单模KERR非线性,同时保留线性光学演变,使玻色子采样方案更加稳健,并因此放大了显示量子优势所需的噪声参数的约束。

Boson sampling, a computational problem conjectured to be hard to simulate on a classical machine, is a promising candidate for an experimental demonstration of quantum advantage using bosons. However, inevitable experimental noise and imperfections, such as loss in the interferometer and random counts at the detectors, could challenge the sampling task from entering the regime where quantum advantage is achievable. In this work we introduce higher order non-linearities as a mean to enhance the computational complexity of the problem and the protocol's robustness against noise, i.e. increase the noise threshold that allows to perform an efficient classical simulation of the problem. Using a phase-space method based on the negativity volume of the relevant quasi-probability distributions, we establish a necessary non-classicality condition that any experimental proof of quantum advantage must satisfy. Our results indicate that the addition of single-mode Kerr non-linearity at the input state preparation level, while retaining a linear-optical evolution, makes the Boson sampling protocol more robust against noise and consequently relaxes the constraints on noise parameters required to show quantum advantage.

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