Evaluating the noise resilience of variational quantum algorithms

We simulate the effects of different types of noise in state preparation circuits of variational quantum algorithms. We find that the inclusion of redundant parameterised gates makes the quantum circuits more resilient to noise. We also identify the presence of a circuit-dependent noise threshold above which the variational optimisation can converge to states with largely different physical properties from the true target state.

Enrico Fontana, Nathan Fitzpatrick, David Muñoz Ramo, Ross Duncan, Ivan Rungger

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