I have been using the Ignis module for performing error mitigation but it accounts only for the measurement errors. For this reason, I want to know if there is some way to perform gate error mitigation using Qiskit.
One naive way is based from this paper, Cloud Quantum Computing of an Atomic Nucleus, by adding odd number of CNOTs gate to the circuit and do extrapolation. It is kinda hand wavy and you hope that it will gives you something closer to the true result.
So let's say your original circuit is:
Here you have 1 CNOT gate. Then you would perform another execution using a longer but identical circuit:
Here you have 3 CNOT gates. At this point, you use the two results to do your extrapolation.