Macroscopically distinct quantum-superposition states as a bosonic code for amplitude damping
P. T. Cochrane, Gerard J Milburn, William J. Munro · Physical Review A · 1999
We show how macroscopically distinct quantum superposition states (Schr\"odinger cat states) may be used as logical qubit encodings for the correction of spontaneous emission errors. Spontaneous emission causes a bit flip error, which is easily corrected by a standard error correction circuit. The method works arbitrarily well as the distance between the amplitudes of the superposed coherent states increases.