qiskit.algorithms.estimate_observables

estimate_observables(estimator, quantum_state, observables, parameter_values=None, threshold=1e-12)

Accepts a sequence of operators and calculates their expectation values - means and metadata. They are calculated with respect to a quantum state provided. A user can optionally provide a threshold value which filters mean values falling below the threshold.

প্যারামিটার

• estimator (BaseEstimator) -- An estimator primitive used for calculations.

• quantum_state (QuantumCircuit) -- A (parameterized) quantum circuit preparing a quantum state that expectation values are computed against.

• observables (ListOrDict[BaseOperator | PauliSumOp]) -- A list or a dictionary of operators whose expectation values are to be calculated.

• parameter_values (Sequence[float] | None) -- Optional list of parameters values to evaluate the quantum circuit on.

• threshold (float) -- A threshold value that defines which mean values should be neglected (helpful for ignoring numerical instabilities close to 0).

রিটার্নস

A list or a dictionary of tuples (mean, metadata).

রেইজেস

AlgorithmError -- If a primitive job is not successful.

রিটার্ন টাইপ

ListOrDict[tuple[complex, dict[str, Any]]]