Figure 8: Process matrix of the CNOT gate.
From: Adding control to arbitrary unknown quantum operations
(a) Ideal process matrix. (b) Maximum-likelihood experimentally reconstructed process matrix. (i) Real and (ii) imaginary parts are shown. We observe a high process fidelity of 96.13±0.17% with the ideal case. The error estimate is obtained by performing many reconstructions with random noise added to the raw data in each case. Matrices are presented in the standard Pauli basis38.
