Speaker
Description
Fast and accurate two-qubit gates are a key requirement to perform complex algorithms on current quantum computers. Typical gates have errors less than 5% and take around 200ns. Shorter gates result in unwanted leakage out of the computational subspace. Optimal control theory aims to design fast control pulses that suppress side effects such as cross talk and leakage. However, even with an accurately calibrated system model, control pulses require a tune-up to accommodate for parameter drifts and model inaccuracies. Here, we present our work on methods to simultaneously calibrate control pulses defined by up to 20 parameters. We improve the interplay between the control instruments and the multidimensional optimization algorithms to reduce the hardware constraints to realize efficient tune-up feedback-loops.
