Gaussian boson sampling at finite temperature
Gaussian boson sampling at finite temperature
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DOI：
10.1103/physreva.109.013707
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发表时间：
2023-08
影响因子：
2.9
通讯作者：
G. Bressanini;Hyukjoon Kwon;M. Kim
中科院分区：
文献类型：
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作者：
G. Bressanini;Hyukjoon Kwon;M. Kim
高斯玻色子采样（GBS）是利用光子进行量子优势实验的一个很有前途的候选者。然而，足够大的噪声可能会阻碍GBS实现进入量子加速可实现的状态。在这里，我们调查如何热噪声影响的经典棘手的通用量子光学采样实验，GBS是后者的一个特殊的例子。我们这样做是通过建立一个有效的模拟是可行的充分条件，表示在相关参数之间的不平等的形式，表征系统和它的缺陷。我们证明了热噪声的加入对剩余的噪声参数具有收紧约束的效果，这是显示量子优势所必需的。此外，我们还证明了存在一个阈值温度，在这个温度下，任何量子采样实验都变得经典模拟，并通过将这种情况与量子态的非经典性质的消失联系起来，提供了一个直观的物理解释。
Gaussian boson sampling (GBS) is a promising candidate for an experimental demonstration of quantum advantage using photons. However, sufficiently large noise might hinder a GBS implementation from entering the regime where quantum speedup is achievable. Here, we investigate how thermal noise affects the classical intractability of generic quantum optical sampling experiments, GBS being a particular instance of the latter. We do so by establishing sufficient conditions for an efficient simulation to be feasible, expressed in the form of inequalities between the relevant parameters that characterize the system and its imperfections. We demonstrate that the addition of thermal noise has the effect of tightening the constraints on the remaining noise parameters, required to show quantum advantage. Furthermore, we show that there exist a threshold temperature at which any quantum sampling experiment becomes classically simulable, and provide an intuitive physical interpretation by relating this occurrence with the disappearance of the quantum state's non-classical properties.