Pairwise Perturbative Ansatz for Quantum Process Tomography Part 2: Experiment

In part two of this talk we present a Pairwise Perturbative Ansatz (PAPA) reconstruction of a three qubit process. For this demonstration, we perform GST characterization on neighboring pairs of qubits in a fully connected three qubit system. The local GST reconstructions constrain the global process. As outlined in part one, this data is used to bootstrap a description of a three qubit process from multiple two-qubit reconstructions. Such an ansatz could lead to characterization techniques that scale favorably in the number of qubits while making few assumptions about the structure of system noise.