Phys. Rev. A 77, 010301(R) (2008) [4 pages]Correctable noise of quantum-error-correcting codes under adaptive concatenation
We examine the transformation of noise under a quantum-error-correcting code (QECC) concatenated repeatedly with itself, by analyzing the effects of a quantum channel after each level of concatenation using recovery operators that are optimally adapted to use error syndrome information from the previous levels of the code. We use the Shannon entropy of these channels to estimate the thresholds of correctable noise for QECCs and find considerable improvements under this adaptive concatenation. Similar methods could be used to increase quantum-fault-tolerant thresholds. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.010301
DOI:
10.1103/PhysRevA.77.010301
PACS:
03.67.Lx
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