论文标题
全光量单向量子中继器
All-photonic one-way quantum repeaters
论文作者
论文摘要
量子中继器是长距离量子通信的关键技术促进器。迄今为止，大多数现有的量子中继器协议都是基于特定的量子代码或图形状态设计的。在本文中，我们根据基于测量的误差校正提出了一个全光音单向量子中继器的一般框架，可以将其适用于任何Calderbank-s-s-s-s-s-s-steane代码，包括最近发现的最近发现的量子量子低密度平价检查（QLDPC）代码。我们提出了一种新颖的解码方案，其中根据整个网络进行的测量结果在目的地进行误差校正过程。该过程不仅超过了独立中继器的常规协议，而且简化了中继器的局部量子操作。例如，我们从数值上表明，[[48,6,8]]广义自行车代码（作为一个小但有效的QLDPC代码）具有同样良好的性能，同时至少减少了资源的数量级。
Quantum repeater is the key technology enabler for long-distance quantum communication. To date, most of the existing quantum repeater protocols are designed based on specific quantum codes or graph states. In this paper, we propose a general framework for all-photonic one-way quantum repeaters based on the measurement-based error correction, which can be adapted to any Calderbank-Shor-Steane codes including the recently discovered quantum low density parity check (QLDPC) codes. We present a novel decoding scheme, where the error correction process is carried out at the destination based on the accumulated data from the measurements made across the network. This procedure not only outperforms the conventional protocols with independent repeaters but also simplifies the local quantum operations at repeaters. As an example, we numerically show that the [[48,6,8]] generalized bicycle code (as a small but efficient QLDPC code) has an equally good performance while reducing the resources by at least an order of magnitude.
