Earlier I asked a question on why statevector_simulator ignores the number of shots when calculating the expectation value of an operator using CircuitSampler. This was attributed to something called the "Aer fast expectation". Can someone explain it in more detail? Also, what should I do if I want to use a noise model with CircuitSampler and statevector_simulator?
As said in an answer to the linked question, this behavior ignores a noise model if passed to the simulator. How do I make sure that the VQE class in Qiskit does not ignore the noise model when using statevector_simulator?
