论文标题
在线性光学网络中使用多轨编码的多部分纠缠的多部分纠缠的生成和评估
Generation and evaluation of multipartite entanglement with multi-rail encoding in linear optics networks
论文作者
论文摘要
线性光学网络是多模干涉仪系统，在该系统中，无法区分的光子输入可以创建无法使用经典计算机模拟的非经典干扰。这种非古典干扰意味着如果我们将其模式分为不同的各方，则其子系统之间存在纠缠。这种系统中的纠缠自然地用多轨（多模式）量子寄存器编码。对于双方纠缠，理论上提出了具有多轨编码的一代和检测方案[NJP 19（10）：103032，2017]，并实验实现了[Optica，7（11）：1517，2020]。在本文中，我们将进一步迈出一步，以建立一个理论，用于检测在固定的线性光学网络的固定局部 - 光子空间子空间中多轨编码的离散可变性的真实多部分纠缠（GME）。我们还提出了一种具有离散变量（单光子）和连续变化（挤压状态）光源的GME生成方案。该方案使我们能够在连续变量系统中揭示离散可变的GME。基于连续变量输入的生成方案，还对光子损失的效果进行了数值分析。
A linear optics network is a multimode interferometer system, where indistinguishable photon inputs can create nonclassical interference that can not be simulated with classical computers. Such nonclassical interference implies the existence of entanglement among its subsystems, if we divide its modes into different parties. Entanglement in such systems is naturally encoded in multi-rail (multi-mode) quantum registers. For bipartite entanglement, a generation and detection scheme with multi-rail encoding has been theoretically proposed [NJP 19(10):103032, 2017] and experimentally realized [Optica, 7(11):1517, 2020]. In this paper, we will take a step further to establish a theory for the detection of multi-rail-encoded discrete-variable genuine multipartite entanglement (GME) in fixed local-photon-number subspaces of linear optics networks. We also propose a scheme for GME generation with both discrete-variable (single photons) and continuous-variable (squeezed states) light sources. This scheme allows us to reveal the discrete-variable GME in continuous-variable systems. The effect of photon losses is also numerically analyzed for the generation scheme based on continuous-variable inputs.
