James R. Wootton, Daniel Loss
An algorithm is presented for error correction in the surface code quantum
memory. This is shown to correct depolarizing noise up to a threshold error
rate of 18.5%, exceeding previous results and coming close to the upper bound
of 18.9%. The time complexity of the algorithm is found to be sub-exponential,
offering a significant speed-up over brute force methods and allowing efficient
error correction for codes of realistic sizes.
View original:
http://arxiv.org/abs/1202.4316
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