I'm trying to run a Variational Quantum Eigensolver (VQE) for H2 on a noisy backend, but the energy minimum keeps drifting. I suspect it's the Readout Error.
Here's my ansatz setup:
```python
from qiskit.circuit.library import EfficientSU2
ansatz = EfficientSU2(2, reps=1)
# ... optimization loop ...
```
Has anyone had success with Error Mitigation techniques like PEC or ZNE for this?
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I've seen similar convergence issues in recent Qiskit versions. Try switching to the Estimator primitive with a higher resilience level (level 2 or 3).