qml.from_openfermion

from_openfermion(openfermion_op, wires=None, tol=1e-16)

Convert OpenFermion FermionOperator to PennyLane FermiWord or FermiSentence and OpenFermion QubitOperator to PennyLane LinearCombination.

Parameters

• openfermion_op (FermionOperator, QubitOperator) – OpenFermion operator.

• wires (dict) – Custom wire mapping used to convert the external qubit operator to a PennyLane operator. Only dictionaries with integer keys (for qubit-to-wire conversion) are accepted. If None, the identity map (e.g., 0->0, 1->1, ...) will be used.

• tol (float) – Tolerance for discarding negligible coefficients.

Returns

PennyLane operator.

Return type

Union[FermiWord, FermiSentence, LinearCombination]

Example

>>> import pennylane as qml
>>> from openfermion import FermionOperator, QubitOperator
>>> of_op = 0.5 * FermionOperator('0^ 2') + FermionOperator('0 2^')
>>> pl_op = qml.from_openfermion(of_op)
>>> print(pl_op)
0.5 * a⁺(0) a(2)
+ 1.0 * a(0) a⁺(2)

>>> of_op = QubitOperator('X0', 1.2) + QubitOperator('Z1', 2.4)
>>> pl_op = qml.from_openfermion(of_op)
>>> print(pl_op)
1.2 * X(0) + 2.4 * Z(1)

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