openfermion.linalg.expectation

Compute the expectation value of an operator with a state.

Main aliases

openfermion.linalg.expectation(
    operator, state
)

Used in the tutorials
Circuits 2: Linear Trotter steps of diagonal Coulomb operators Quantum simulation of electronic structure

Args
operator(scipy.sparse.spmatrix or scipy.sparse.linalg.LinearOperator): The operator whose expectation value is desired. state(numpy.ndarray or scipy.sparse.spmatrix): A numpy array representing a pure state or a sparse matrix representing a density matrix. If `operator` is a LinearOperator, then this must be a numpy array.

Returns
A complex number giving the expectation value.

Raises
`ValueError`	Input state has invalid format.

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Last updated 2021-12-07 UTC.

Args