I need to obtain the expectation value of an observable (I do not care which one) of simulated large quantum circuits, like 30 or more qubits. The quantum circuit can be of any type, but it is important that it isn't one of those easy to simulate (Clifford, separable circuits, etc.).
Is there any available dataset?
Or what's the best way to simulate this kind of quantum circuit (even if I need days, GPUs, etc.)?