Controlled Quantum Dynamics Theory Group, Imperial College London, London SW7 2AZ, UK.
Nat Commun. 2012;3:1036. doi: 10.1038/ncomms2043.
Blind quantum computation is a novel secure quantum-computing protocol that enables Alice, who does not have sufficient quantum technology at her disposal, to delegate her quantum computation to Bob, who has a fully fledged quantum computer, in such a way that Bob cannot learn anything about Alice's input, output and algorithm. A recent proof-of-principle experiment demonstrating blind quantum computation in an optical system has raised new challenges regarding the scalability of blind quantum computation in realistic noisy conditions. Here we show that fault-tolerant blind quantum computation is possible in a topologically protected manner using the Raussendorf-Harrington-Goyal scheme. The error threshold of our scheme is 4.3 × 10(-3), which is comparable to that (7.5 × 10(-3)) of non-blind topological quantum computation. As the error per gate of the order 10(-3) was already achieved in some experimental systems, our result implies that secure cloud quantum computation is within reach.
盲量子计算是一种新颖的安全量子计算协议，它使得没有足够量子技术的爱丽丝可以将她的量子计算委托给拥有完全成熟的量子计算机的鲍勃，这样鲍勃就无法了解爱丽丝的输入、输出和算法。最近在光学系统中演示盲量子计算的原理验证实验，对在现实嘈杂条件下盲量子计算的可扩展性提出了新的挑战。在这里，我们展示了使用 Raussendorf-Harrington-Goyal 方案以拓扑保护的方式进行容错盲量子计算是可能的。我们方案的错误阈值为 4.3×10(-3)，与非盲拓扑量子计算的错误阈值（7.5×10(-3))相当。由于某些实验系统已经实现了每门约 10(-3)的误差，我们的结果意味着安全的云量子计算已经触手可及。
