Fundamental rate-loss trade-off for the quantum internet.
Fundamental rate-loss trade-off for the quantum internet.
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DOI：
10.1038/ncomms13523
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发表时间：
2016-11-25
影响因子：
16.6
通讯作者：
Lo, Hoi-Kwong
中科院分区：
文献类型：
--
作者：
Azuma, Koji;Mizutani, Akihiro;Lo, Hoi-Kwong
量子互联网有望实现量子通信——比如量子隐形传态和量子密钥分发（QKD）——在全球任何客户端之间自由进行，也可以模拟量子多体系统的演化。量子互联网最基本的功能是利用光通道相互连接的中间节点，有效地为两点提供量子纠缠或秘密密钥。通过推广适用于任何网络拓扑结构的Takeoka-Guha-Wilde约束，我们推导出量子互联网协议的基本速率损失权衡。这种权衡与长距离量子通信（如城际QKD和量子中继器）所必需的协议的量子通信效率基本上没有缩放差距。我们的研究结果——对量子互联网提出了实际但普遍的限制——使我们能够把握未来量子互联网的潜力。在未来的量子互联网中，应该通过光通道连接的中间节点在两点之间有效地提供纠缠或密钥。在这里，作者推导出这种协议的一般速率损失权衡，这适用于任何网络拓扑。
The quantum internet holds promise for achieving quantum communication—such as quantum teleportation and quantum key distribution (QKD)—freely between any clients all over the globe, as well as for the simulation of the evolution of quantum many-body systems. The most primitive function of the quantum internet is to provide quantum entanglement or a secret key to two points efficiently, by using intermediate nodes connected by optical channels with each other. Here we derive a fundamental rate-loss trade-off for a quantum internet protocol, by generalizing the Takeoka–Guha–Wilde bound to be applicable to any network topology. This trade-off has essentially no scaling gap with the quantum communication efficiencies of protocols known to be indispensable to long-distance quantum communication, such as intercity QKD and quantum repeaters. Our result—putting a practical but general limitation on the quantum internet—enables us to grasp the potential of the future quantum internet. In a future quantum internet, entanglement or a secret key should be efficiently provided between two points via intermediate nodes connected by optical channels. Here the authors derive general rate-loss trade-off for such protocols, that is applicable to any network topology.
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