Quantifying the sensitivity to errors in analog quantum simulation

Understand

Quantum simulators are widely seen as one of the most promising near-term applications of quantum technologies.

• However, it remains unclear to what extent a noisy device can output reliable results in the presence of unavoidable imperfections.
• Here we propose a framework to characterize the performance of quantum simulators by linking the robustness of measured quantum expectation values to the spectral properties of the output observable, which in turn can be associated with its macroscopic or microscopic character.
• We show that, under general assumptions and on average over all states, imperfect devices are able to reproduce the dynamics of macroscopic observables accurately, while the relative error in the expectation value of microscopic observables is much larger on average.