Pt. Cochrane et al., Macroscopically distinct quantum-superposition states as a bosonic code for amplitude damping, PHYS REV A, 59(4), 1999, pp. 2631-2634
We show how macroscopically distinct quantum superposition states (Schrodin
ger cat states) may be used as logical qubit encodings for the correction o
f spontaneous emission errors. Spontaneous emission causes a bit flip error
, which is easily corrected by a standard error correction circuit. The met
hod works arbitrarily well as the distance between the amplitudes of the su
perposed coherent states increases. [S1050-2947(99)06503-8].