qiskit.aqua.operators.legacy.covariance

covariance(data, pauli_1, pauli_2, avg_1, avg_2)

Compute the covariance matrix element between two Paulis, given the measurement outcome. Appropriate post-rotations on the state are assumed.

Parameters

• data (dict) – a dictionary of the form data = {‘00000’: 10} ({str:int})
• pauli_1 (Pauli) – a Pauli class member
• pauli_2 (Pauli) – a Pauli class member
• avg_1 (float) – expectation value of pauli_1 on data
• avg_2 (float) – expectation value of pauli_2 on data

Returns

the element of the covariance matrix between two Paulis

Return type

float