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AerPauliExpectation

AerPauliExpectation GitHub(opens in a new tab)

Bases: qiskit.opflow.expectations.expectation_base.ExpectationBase

An Expectation converter for using Aer’s operator snapshot to take expectations of quantum state circuits over Pauli observables.


Methods Defined Here

compute_variance

AerPauliExpectation.compute_variance(exp_op)

Compute the variance of the expectation estimator. Because Aer takes this expectation with matrix multiplication, the estimation is exact and the variance is always 0, but we need to return those values in a way which matches the Operator’s structure.

Parameters

exp_op (OperatorBase) – The full expectation value Operator after sampling.

Return type

Union[list, float]

Returns

The variances or lists thereof (if exp_op contains ListOps) of the expectation value estimation, equal to 0.

convert

AerPauliExpectation.convert(operator)

Accept an Operator and return a new Operator with the Pauli measurements replaced by AerSnapshot-based expectation circuits.

Parameters

operator (OperatorBase) – The operator to convert. If it contains non-hermitian terms, the operator is decomposed into hermitian and anti-hermitian parts.

Return type

OperatorBase

Returns

The converted operator.

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