Quantum computing with error prone components joined by a 'noisy network'

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• Simon Benjamin (University of Oxford)
• Wednesday 13 February 2013, 14:00-15:30
• Rutherford building, Seminar Room B.

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A scalable quantum computer could be built by networking together many simple processor cells, thus avoiding the need to create a single complex structure. The difficulty is that realistic quantum links are very error prone. Here we describe an architectural approach that absorbs communication errors through a topological encoding. Given a realistically noisy network (~10% error rate) we find that intra-cell error rates for initialisation, state manipulation and measurement can simultaneously exceed 0.82% before the protocol fails. This level of fidelity may prove to be achievable in several laboratory systems, and moreover there is scope for further raising the threshold by optimising the theoretical scheme to a given experimental context

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