Fig. 1: Protocol schematic overview.
From: Readout error mitigated quantum state tomography tested on superconducting qubits
a Detector tomography: A complete set of basis states (e.g., the Pauli states) are prepared and measured repeatedly by the experiment. Based on the outcomes of the measurements, a positive operator-valued measure (POVM) is reconstructed. In a sense, it associates the measured outcome (here visualized as spin up/down measurements) with a measurement effect \({\tilde{M}}_{i}\). b State tomography: Using the reconstructed POVM, the modified likelihood function is endowed with knowledge of the operation of the measurement device. The system of interest is then prepared and measured repeatedly with the desired number of shots.
