Naomi H. Nickerson, Ying Li, Simon C. Benjamin
A quantum computer could be built by networking together many simple processor cells. The difficulty is that realistic quantum links are very error prone. A solution is for cells to repeatedly communicate with each other and so 'purify' any imperfections; however prior studies suggest that the cells themselves must then have extremely low internal error rates. Here we describe a method by which even error-prone cells can perform purification: groups of cells generate shared resource states, which then enable stabilization of topologically encoded data. Given a realistically noisy network (>10% error rate) we find that intra-cell error rates for initialisation, state manipulation and measurement can simultaneously exceed 0.75% before the protocol fails.
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http://arxiv.org/abs/1211.2217
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