I'm reading the mitiq zero noise extrapolation documentation and I just can't make sense of how the scale_factor for folding work.
"The minimum scale factor is one (which corresponds to folding no gates). A scale factor of three corresponds to folding all gates locally. Scale factors beyond three begin to fold gates more than once."
I made a quick qiskit example for convenience:
import qiskit as q from mitiq.zne.scaling import fold_gates_from_left n_qubits = 4 circ = QuantumCircuit(n_qubits) circ.h(0) for qubit in range(n_qubits - 1): circ.cx(qubit, qubit + 1) circ.measure_all() print(circ)
folded = fold_gates_from_left(circ, scale_factor=2.) print("Folded circuit:", folded, sep="\n")