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AKPIK: Arbeitskreis Physik, moderne Informationstechnologie und Künstliche Intelligenz
AKPIK 4: AKPIK III: Simulation & Application
AKPIK 4.6: Talk
Thursday, March 18, 2021, 17:15–17:30, AKPIKa
Error Mitigation Methods in Quantum Computing — •Tom Weber1, Matthias Riebisch1, Kerstin Borras2, Karl Jansen2, and Dirk Krücker2 — 1University of Hamburg (Germany) — 2DESY (Germany)
There is a variety of problems or applications in which we expect quantum computers to outperform their classical counterparts in the future. However, as of today quantum devices are prone to high error rates and we therefore need to be able to deal with noise. Due to the relatively small qubit numbers presently available we cannot use full correction procedures, but instead are rather left with minimising the effects of errors on computational results with other techniques, known as quantum error mitigation.
During the execution of a quantum circuit on a quantum device, noise can occur at every stage. The preparation of the initial state, its further manipulation as well as the final measurement are all affected by errors. We present possible ideas to model different types of noise and explain ways to mitigate them. Moreover, we test those ideas in the context of variational quantum eigensolvers, which form a typical algorithm for quantum computers. The different approaches differ in effectiveness, flexibility and computational effort. To make quantum computing usable in the near future, we are working to develop mitigation methods which combine all these benefits.