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FM: Fall Meeting

FM 22: Quantum Control

FM 22.2: Talk

Montag, 23. September 2019, 17:00–17:15, 3042

Optimal Control of Superconducting Qubits — •Max Werninghaus¹, Daniel J. Egger¹, Marc Ganzhorn¹, Federico Roy², Shai Machnes², Frank Wilhelm-Mauch², and Stefan Filipp¹ — ¹IBM Research Zurich — ²Saarland University

Fast and accurate two-qubit gates are a key requirement to perform complex algorithms on current quantum computers. Ideally, the duration of the gate should be much shorter than the coherence time of the system. However, shorter gates can result in unwanted leakage out of the computational subspace. Optimal control theory aims to design fast control pulses suppressing such side effects of the driving field. However, even with an accurately calibrated system model, control pulses require a tune-up to accommodate for parameter-drifts and -inaccuracies. Here we present our work on techniques to speed up calibration routines of control pulses defined by up to 20 parameters. We improve the interplay of control instruments and multidimensional optimization algorithms to reduce hardware constraints to realize efficient tune-up feedback-loops.