Diagnostic Single-Qubit Gate Monitoring with Continuous Measurements*

The physical implementation of a quantum gate generally deviates from the desired qubit operation. In order to improve the gate fidelity, we use continuous weak measurements to track the quantum map as it develops in time, so as to identify the origin of any deviations from the desired evolution. This gives insight into how to modify the qubit design as well as the controls applied. We test this diagnostic method on single qubit gates with both correlated and uncorrelated noise.