论文标题
通过确定性生成的光子图态启用的量子中继器的性能分析
Performance analysis of quantum repeaters enabled by deterministically generated photonic graph states
论文作者
论文摘要
通过将逻辑Qubits编码为特定类型的光子图状态，人们可以实现量子中继器，从而使快速的纠缠分布率接近经典通信。但是，这些光子图状态的产生需要使用基于线性光学器件的传统方法来建立强大的资源开销。克服这一挑战，已经提出了许多新方案，这些方案采用量子发射器来确定性地生成光子图状态。尽管这些方案有可能显着降低资源成本，但缺乏对不同编码和不同发电方案之间的中继器性能进行系统的比较。在这里，我们根据两个不同的图状态（即树图状态和中继器图状态）定量分析量子中继器的性能。对于这两种状态，我们都比较了两个世代方案之间的性能，一个方案基于一个与辅助物质量子的单个量子发射器相结合的，一个基于一个基于单个量子发射极与延迟反馈的单个量子发射极。我们在不同系统参数上标识数值最佳方案。我们的分析提供了有关基于图形状态的量子中继器的生成方案的选择的明确指南，并列出了不同方案的未来实验实现的参数要求。
By encoding logical qubits into specific types of photonic graph states, one can realize quantum repeaters that enable fast entanglement distribution rates approaching classical communication. However, the generation of these photonic graph states requires a formidable resource overhead using traditional approaches based on linear optics. Overcoming this challenge, a number of new schemes have been proposed that employ quantum emitters to deterministically generate photonic graph states. Although these schemes have the potential to significantly reduce the resource cost, a systematic comparison of the repeater performance among different encodings and different generation schemes is lacking. Here, we quantitatively analyze the performance of quantum repeaters based on two different graph states, i.e. the tree graph states and the repeater graph states. For both states, we compare the performance between two generation schemes, one based on a single quantum emitter coupled to ancillary matter qubits, and one based on a single quantum emitter coupled to a delayed feedback. We identify the numerically optimal scheme at different system parameters. Our analysis provides a clear guideline on the selection of the generation scheme for graph-state-based quantum repeaters, and lays out the parameter requirements for future experimental realizations of different schemes.
