  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.
