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Progress in Quantum Computer Error Correction
June 2, 2014 (HP78). Papers  and  describe progress in demonstrating the effectiveness the surface code method of quantum error correction for logic gates involving superconducting qubits. Generally, the fidelity threshold should be better than 99% for such methods to be applicable. In particular John Martinis’s group at University of Califonia, Santa Barbara (UCSB), and external collaborators demonstrated two qubit gate fidelity of up to 99.4 % . Their quantum processor is a first step towards the surface code, using five qubits arranged in a linear array with nearest-neighbor coupling. As a further demonstration, they constructed a five-qubit complete circuit and full set of gates. They claim to have demonstrated that Josephson quantum computing is a high-fidelity technology, with a clear path to scaling up to large-scale, fault-tolerant quantum circuits.
IEEE Spectrum, the popular IEEE magazine for that Institute members, published recently an article “Amazingly Accurate Quantum Computing” by Jeremy Hsu, which in the free-access online form released on May 26, 2014, has the title “Error Correction Moves Quantum Computing Closer to Reality”. It is based on references cited above.
 R. Barends et al., Nature 508, 500-503 (2014), doi:10.1038/nature13171.
 Jerry M. Chow et al., arXiv:1311.6330 [quant-ph]