Surface Code Quantum Communication
Surface Code Quantum Communication
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DOI：
10.1103/physrevlett.104.180503
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发表时间：
2010-05-07
影响因子：
8.6
通讯作者：
Hollenberg, Lloyd C. L.
中科院分区：
文献类型：
--
作者：
Fowler, Austin G.;Wang, David S.;Hollenberg, Lloyd C. L.
量子通信通常涉及中继站的线性链，每个中继站都能够进行可靠的本地量子计算，并通过不可靠的通信链路连接到最近的邻居。现有协议采用双向经典通信方式，通信速率较低。通过在中继器链上使用表面码，并在相邻站之间生成贝尔对，其成功概率大于0.65，保真度大于0.96，我们表明可以避免双向通信，并且量子信息可以在任意距离上以任意低的误差以仅受本地门速度限制的速率发送。这是通过使用不可靠的贝尔对来测量非本地稳定器并将预报的故障信息馈送到传输后纠错来实现的。我们的方案也适用于预测成功的概率任意低的情况。
Quantum communication typically involves a linear chain of repeater stations, each capable of reliable local quantum computation and connected to their nearest neighbors by unreliable communication links. The communication rate of existing protocols is low as two-way classical communication is used. By using a surface code across the repeater chain and generating Bell pairs between neighboring stations with probability of heralded success greater than 0.65 and fidelity greater than 0.96, we show that two-way communication can be avoided and quantum information can be sent over arbitrary distances with arbitrarily low error at a rate limited only by the local gate speed. This is achieved by using the unreliable Bell pairs to measure nonlocal stabilizers and feeding heralded failure information into post-transmission error correction. Our scheme also applies when the probability of heralded success is arbitrarily low.