Routing entanglement in the quantum internet
Routing entanglement in the quantum internet
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DOI：
10.1038/s41534-019-0139-x
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发表时间：
2017-08
影响因子：
7.6
通讯作者：
M. Pant;H. Krovi;D. Towsley;L. Tassiulas;Liang Jiang;P. Basu;D. Englund;S. Guha
中科院分区：
文献类型：
--
作者：
M. Pant;H. Krovi;D. Towsley;L. Tassiulas;Liang Jiang;P. Basu;D. Englund;S. Guha
远程量子纠缠可以实现许多应用，包括分布式量子计算、保密通信和精密传感。我们考虑一个量子网络--配备了有限量子处理能力的节点，通过有损耗的光链路连接--如何在多对用户之间同时分配高速纠缠。我们开发了这样的量子中继器节点的协议，通过利用网络中多条路径的多样性，使一对用户通过使用线性量子中继器链来实现纠缠率的大幅提高。此外，我们开发了中继器协议，使多个用户对能够以远远超过中继器在辅助单个纠缠流之间分时的速率同时产生纠缠。我们的结果表明，具有短相干时间的量子存储器的早期发展和概率Bell态测量的实现可以对量子网络产生比分析线性中继链明显得多的更深刻的影响。这一框架应该会促进一般量子网络理论的发展，将量子存储物理、量子信息理论、量子纠错和计算机网络理论结合在一起。
Remote quantum entanglement can enable numerous applications including distributed quantum computation, secure communication, and precision sensing. We consider how a quantum network—nodes equipped with limited quantum processing capabilities connected via lossy optical links—can distribute high-rate entanglement simultaneously between multiple pairs of users. We develop protocols for such quantum “repeater” nodes, which enable a pair of users to achieve large gains in entanglement rates over using a linear chain of quantum repeaters, by exploiting the diversity of multiple paths in the network. Additionally, we develop repeater protocols that enable multiple user pairs to generate entanglement simultaneously at rates that can far exceed what is possible with repeaters time sharing among assisting individual entanglement flows. Our results suggest that the early-stage development of quantum memories with short coherence times and implementations of probabilistic Bell-state measurements can have a much more profound impact on quantum networks than may be apparent from analyzing linear repeater chains. This framework should spur the development of a general quantum network theory, bringing together quantum memory physics, quantum information theory, quantum error correction, and computer network theory.