Papers › Concatenation Schemes for Topological Fault-tolerant Quantum Error Correction
Concatenation Schemes for Topological Fault-tolerant Quantum Error Correction
Zhaoyi Li, Isaac Kim, Patrick Hayden
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We investigate a family of fault-tolerant quantum error correction schemes based on the concatenation of small error detection or error correction codes with the three-dimensional cluster state. We propose fault-tolerant state preparation and decoding schemes that effectively convert every circuit-level error into an erasure error, leveraging the cluster state's high threshold against such errors. We find a set of codes for which such a conversion is possible, and study their performance against the standard circuit-level depolarizing model. Our best performing scheme, which is based on a concatenation with a classical code, improves the threshold by 16.5% and decreases the spacetime overhead by 32% compared to the scheme without concatenation, with each scheme subject to a physical error rate of 10⁻³ and achieving a logical error rate of 10⁻⁶.
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