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 quantumcomputation to Bob, who has a fully fledged quantum computer, in such a way that Bobcannot learn anything about Alice’s input, output and algorithm. A recent proof-of-principleexperiment demonstrating blind quantum computation in an optical system has raised newchallenges regarding the scalability of blind quantum computation in realistic noisy conditions.Here we show that fault-tolerant blind quantum computation is possible in a topologicallyprotected manner using the Raussendorf–Harrington–Goyal scheme. The error threshold of ourscheme is 4.3×10~(-3), which is comparable to that (7.5×10~(-3)) of non-blind topological quantumcomputation. As the error per gate of the order 10~(-3) was already achieved in some experimentalsystems, our result implies that secure cloud quantum computation is within reach.
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