pygsti.tools.mcfetools.fidelity_to_polarization

fidelity_to_polarization(f, n)

Utility function for MCFE VBDataFrame creation.

Maps a process fidelity f for an n-qubit circuit to the polarization p, defined by p = 1 - (4**n)*(1 - f)/(4**n - 1). For large n, the difference between p and f is negligible and the calculation of 4**n is prohibitive, so we impose a cutoff above which we assert p = f.

Parameters:

• p (float) – circuit polarization

• n (int) – number of qubits in the circuit.

• f (float)

Returns:

circuit process fidelity.

Return type:

float