Compressed quantum error mitigation
Maurits S. J. Tepaske, David J. Luitz · Physical review. B./Physical review. B · 2023
We introduce a quantum error mitigation technique based on probabilistic error cancellation to eliminate errors which have accumulated during the application of a quantum circuit. Our approach is based on applying an optimal ``denoiser'' after the action of a noisy circuit and can be performed with an arbitrary number of extra gates. The denoiser is given by an ensemble of circuits distributed with a quasiprobability distribution. For a simple noise model, we show that efficient, local denoisers can be found and we demonstrate their effectiveness for the digital quantum simulation of the time evolution of simple spin chains.