论文标题
光子混合状态纠缠使用猫状态叠加
Photonic Hybrid State Entanglement Swapping using Cat State Superpositions
论文作者
论文摘要
我们建议在纠缠交换方案中使用混合纠缠，作为将高保真的钟状态分配给两个当事方，爱丽丝和鲍勃的手段。这项工作中使用的混合纠缠被描述为离散变量（FOCK状态）和连续变量（CAT状态叠加）纠缠状态。我们在通过射影真空 - 一个光子测量和通过平衡的同伴检测来检测这些状态之前，在两个传播连续变量模式之间建模光子损失水平和不相等的光子损失水平。我们研究了本协议中选择的测量方案的同伴测量缺陷以及相关的成功概率。 我们表明，我们的纠缠交换方案具有弹性的光子损失水平，以及两个传播模式之间的平均不相等损失水平，并显示了这种损失弹性的提高，而相对于其他混合纠缠方案，使用相干状态叠加作为传播模式，则这种损失弹性的损失有所改善。最后，我们得出的结论是，我们的协议适用于潜在的量子网络应用程序，这些量子网络应用需要两个节点在与合适的纠缠净化方案一起使用时，需要两个节点在5-10公里的距离内分开。
We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties, Alice and Bob. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state superposition) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement imperfections, and the associated success probability of the measurement schemes chosen in this protocol. We show that our entanglement swapping scheme is resilient to low levels of photonic losses, as well as low levels of averaged unequal losses between the two propagating modes, and show an improvement in this loss resilience over other hybrid entanglement schemes using coherent state superpositions as the propagating modes. Finally, we conclude that our protocol is suitable for potential quantum networking applications which require two nodes to share entanglement separated over a distance of 5-10 km when used with a suitable entanglement purification scheme.
