pygsti.fidelity¶
-
pygsti.
fidelity
(A, B)¶ - Returns the quantum state fidelity between density
matrices A and B given by :
F = Tr( sqrt{ sqrt(A) * B * sqrt(A) } )^2
To compute process fidelity, pass this function the Choi matrices of the two processes, or just call the process_fidelity function with the gate matrices.
Parameters: - A (numpy array) – First density matrix.
- B (numpy array) – Second density matrix.
Returns: The resulting fidelity.
Return type: float