Minimal qudit code for a qubit in the phase-damping channel
Stefano Pirandola, Stefano Mancini, Samuel L. Braunstein, David Vitali · Physical Review A · 2008
Using the stabilizer formalism we construct the minimal code into a $D$-dimensional Hilbert space (qudit) to protect a qubit against phase damping. The effectiveness of this code is then studied by means of input-output fidelity.