  Solid state qubits realized in superconducting circuits are potentially
extremely scalable. However, strong decoherence may be transferred to the
qubits by various elements of the circuits that couple individual qubits,
particularly when coupling is implemented over long distances. We propose here
an encoding that provides full protection against errors originating from these
coupling elements, for a chain of superconducting qubits with a nearest
neighbor anisotropic XY-interaction. The encoding is also seen to provide
partial protection against errors deriving from general electronic noise.

Superconductivity;Mesoscale and Nanoscale Physics;Quantum Physics