Blind topological measurement-based quantum computation

Tomoyuki Morimae () and Keisuke Fujii
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Tomoyuki Morimae: Controlled Quantum Dynamics Theory Group, Imperial College London
Keisuke Fujii: Science Graduate School of Engineering Science, Osaka University

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract 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.

Date: 2012
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DOI: 10.1038/ncomms2043

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