论文标题
无法区分的光子蒸馏
Distillation of Indistinguishable Photons
论文作者
论文摘要
相同（难以区分的）光子的可靠来源是利用干扰效应的先决条件，这是基于线性光学量子计算的必要组成部分，以及诸如Boson采样的应用。一般而言，区分性的程度将确定特定方法的功效，例如，通过限制构造的资源状态的保真度，或降低光电电路输出分布的复杂性。因此，这与高度纯净和难以区分的光子的工程师宣告的来源具有很大的实际相关性。受魔术状态蒸馏的启发，我们使用标准线性光学器件提出了一项协议，该协议可用于提高光子源的无法区分性，以任意准确。特别是，在小错误$ε$的渐近极限中，要将误差降低到$ε'<ε$需要$ o（（ε/ε'）^2）$光子。我们证明了该方案在光学组件中检测和控制误差是可靠的，并讨论了其他误差源的效果。
A reliable source of identical (indistinguishable) photons is a prerequisite for exploiting interference effects, which is a necessary component for linear optical based quantum computing, and applications thereof such as Boson sampling. Generally speaking, the degree of distinguishability will determine the efficacy of the particular approach, for example by limiting the fidelity of constructed resource states, or reducing the complexity of an optical circuits output distribution. It is therefore of great practical relevance to engineer heralded sources of highly pure and indistinguishable photons. Inspired by magic state distillation, we present a protocol using standard linear optics which can be used to increase the indistinguishability of a photon source, to arbitrary accuracy. In particular, in the asymptotic limit of small error $ε$, to reduce the error to $ε' < ε$ requires $O((ε/ε')^2)$ photons. We demonstrate the scheme is robust to detection and control errors in the optical components, and discuss the effect of other error sources.
