Experimental Realization of Optimal Noise Estimation for a General Pauli Channel
Andrea Chiuri, Valeria Rosati, Giuseppe Vallone, Sebastião Pádua, H. Imai, Sandro Giacomini, Chiara Macchiavello, Paolo Mataloni · Physical Review Letters · 2011
We present the experimental realization of the optimal estimation protocol for a Pauli noisy channel. The method is based on the generation of 2-qubit Bell states and the introduction of quantum noise in a controlled way on one of the state subsystems. The efficiency of the optimal estimation, achieved by a Bell measurement, is shown to outperform quantum process tomography.