document: Comprehensive encoding and decoupling solution to problems of decoherence and design in solid-state quantum computing Proposals for scalable quantum computing devices suffer not only from decoherence due to the interaction with their environment , but also from severe engineering constraints . Here we introduce a practical solution to these major concerns , addressing solid-state proposals in particular . Decoherence is first reduced by encoding a logical qubit into two qubits , then completely eliminated by an efficient set of decoupling pulse sequences . The same encoding removes the need for single-qubit operations , which pose a difficult design constraint . We further show how the dominant decoherence processes can be identified empirically , in order to optimize the decoupling pulses
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