Error-mitigated digital quantum simulation

TL;DR

This paper introduces a stabiliser-like error mitigation method for variational quantum algorithms, capable of detecting up to 80% of depolarising errors, enhancing near-term quantum computations.

Contribution

The authors develop a novel error mitigation technique that detects a high percentage of depolarising errors, improving the reliability of variational quantum simulations on near-term hardware.

Findings

Detects 60-80% of depolarising errors

Effective against stochastic and correlated noise

Enhances existing error mitigation techniques

Abstract

Variational algorithms may enable classically intractable simulations on near-future quantum computers. However, their potential is limited by hardware errors. It is therefore crucial to develop efficient ways to mitigate these errors. Here, we propose a stabiliser-like method which enables the detection of up to 60 - 80 % of depolarising errors. Our method is suitable for near-term quantum hardware. Simulations show that our method can significantly benefit calculations subject to both stochastic and correlated noise, especially when combined with existing error mitigation techniques.