title: Blind topological measurement-based quantum computation.
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.
authors.affiliation: Controlled Quantum Dynamics Theory Group, Imperial College London, London SW7 2AZ, UK. morimae@gmail.com
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Morimae
authors.forename: Keisuke
authors.initials: K
authors.lastname: Fujii