基于波分复用的量子光网络中使用多个纠缠源的分布式纠缠分发
Distributed Entanglement Distribution Using Multiple Entanglement Sources in WDM-based Quantum Optical Networks
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中文总结 AI 辅助
研究基于WDM的量子光网络中多纠缠源的分布式纠缠分发，采用多跳无中继网状网络架构，利用单光子和双光子纠缠分发的混合方法，实验表征自制EPPS并模拟，发现该方法在EPPS放置上更灵活，能更好利用纠缠资源并接受更高需求。
中文摘要 AI 辅助
近期已有使用基于单自发参量下转换（SPDC）的宽带纠缠光子对源（EPPS）实现量子网络的报道。本文利用纠缠光子对的波长相关性，采用传统波分复用（WDM）方法按波长路由光子，单EPPS产生的纠缠光子对以集中方式分发到网络中不同节点对，但受其能产生的纠缠波长对数量限制。为使更多节点对纠缠，可采用多个EPPS。本文提出基于WDM的多跳无中继网状光网络中使用多个EPPS的纠缠分发方法，对两个自制EPPS进行实验表征并考虑多个EPPS进行网络级模拟，针对不同纠缠需求，考虑网络中光纤长度和跳数导致的纠缠比特率和可见度下降来进行EPPS放置/选择、波长对分配和光子对路由。研究的两个主要发现：单光子（OP）和双光子（BP）纠缠分发的混合方法在多EPPS放置上提供更高灵活性；与集中式纠缠分发相比，使用多个EPPS的分布式纠缠分发能更好地利用纠缠资源并接受更高纠缠需求。
英文摘要
Quantum network implementations using single spontaneous parametric downconversion (SPDC)-based broadband entangled photon pair source (EPPS) have been reported recently. Here, leveraging the wavelength-correlation between entangled photon pairs, the traditional wavelength division multiplexing (WDM) method is utilized to route photons based on their wavelengths. From single EPPS, entangled photon pairs are distributed in a centralized way to different node pairs in the network. However, the number of nodes pairs that can be entangled in a network is limited by the number of entangled wavelength pairs that an EPPS can generate. To entangle a higher number of node pairs in a network, multiple EPPSs can be employed. In this work, we present a WDM-based entanglement distribution approach using multiple EPPSs in multi-hop repeaterless mesh optical networks. We experimentally characterize two EPPSs developed in-house and consider multiple such EPPSs in the network to perform network-level simulations. We consider heterogeneous entanglement demands requiring different entanglement bit (ebit) rates and entanglement visibility. For each entanglement demand, EPPS placement/selection, wavelength-pair assignment, and photon pair routing are performed considering the degradation in both ebit rate and visibility with fiber length and hops in the network. Two main findings of this study include: (i) a hybrid approach of one-photon (OP) and both-photon (BP) entanglement distribution provides higher flexibility in multi-EPPS placement and (ii) distributed entanglement distribution using multiple EPPSs enables better entanglement resource utilization and higher entanglement demand acceptance as compared to centralized entanglement distribution.
