Simplified quantum error detection and correction for superconducting qubits

@article{Keane2012SimplifiedQE,
  title={Simplified quantum error detection and correction for superconducting qubits},
  author={K G Keane and Alexander N. Korotkov},
  journal={Physical Review A},
  year={2012},
  volume={86},
  pages={012333}
}
We analyze simple quantum error detection and quantum error correction protocols relevant to current experiments with superconducting qubits. We show that for qubits with energy relaxation the repetitive N-qubit codes cannot be used for quantum error correction, but can be used for quantum error detection. In the latter case it is sufficient to use only two qubits for the encoding. In the analysis we demonstrate a useful technique of unraveling the qubit energy relaxation into "relaxation" and… 

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