Encoding a logical qubit into physical qubits
  We propose two protocols to encode a logical qubit into physical qubits relying on common types of qubit-qubit interactions in as simple forms as possible. We comment on its experimental implementation in several quantum computing architectures, e.g. with trapped atomic ion qubits, atomic qubits inside a high Q optical cavity, solid state Josephson junction qubits, and Bose-Einstein condensed atoms. 
B. Zeng, D. L. Zhou, Z. Xu, C. P. Sun, and L. You