论文标题
使用从几件Qubits生成的全光量图状态的有效量子通信的资源要求
Resource requirements for efficient quantum communication using all-photonic graph states generated from a few matter qubits
论文作者
论文摘要
量子通信技术对应用程序的巨大希望，从秘密消息的安全传输到分布式量子计算。由于纤维损失，长距离量子通信需要使用量子中继器，其中存在基于量子存储器的方案和全光量方案。尽管基于线性光学的图形状态的全光量方法避免了与记忆相关的连贯时间问题，但它们仅以牺牲资源的高度大开销为代价而超过无中继器的协议。在这里，我们考虑使用物质量子位生成光子图状态并详细分析资源和性能之间的权衡，其特征是每个物质量子的可实现的秘密关键率。我们表明，物质量子位和高光子收集和检测效率之间的快速两倍的纠缠大门是全光量协议所需的主要成分，以胜过无关紧要的和基于内存的方案。
Quantum communication technologies show great promise for applications ranging from the secure transmission of secret messages to distributed quantum computing. Due to fiber losses, long-distance quantum communication requires the use of quantum repeaters, for which there exist quantum memory-based schemes and all-photonic schemes. While all-photonic approaches based on graph states generated from linear optics avoid coherence time issues associated with memories, they outperform repeater-less protocols only at the expense of a prohibitively large overhead in resources. Here, we consider using matter qubits to produce the photonic graph states and analyze in detail the trade-off between resources and performance, as characterized by the achievable secret key rate per matter qubit. We show that fast two-qubit entangling gates between matter qubits and high photon collection and detection efficiencies are the main ingredients needed for the all-photonic protocol to outperform both repeater-less and memory-based schemes.
