openfermion.linalg.variance

Compute variance of operator with a state.

Main aliases

openfermion.linalg.variance(
    operator, state
)

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.

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.

Returns
A complex number giving the variance.

Raises
`ValueError`	Input state has invalid format.

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Last updated 2025-02-12 UTC.