---
title: majorana_operator (latest version)
description: API reference for qiskit_fermions.mappers.library.majorana_operator in the latest version of qiskit-fermions
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit-fermions/mappers-library-majorana-operator
---

# majorana\_operator

`majorana_operator(operator)`

Converts an operator into a [`MajoranaOperator`](/docs/api/qiskit-fermions/operators-majorana-operator "qiskit_fermions.operators.MajoranaOperator").

This is a thin, type-agnostic wrapper around the [`SupportsMajoranaOperator`](/docs/api/qiskit-fermions/protocols-supports-majorana-operator "qiskit_fermions.protocols.SupportsMajoranaOperator") protocol method, mirroring the free-function style of [`fermion_operator()`](/docs/api/qiskit-fermions/mappers-library-fermion-operator "qiskit_fermions.mappers.library.fermion_operator").

**Parameters**

**operator** ([*SupportsMajoranaOperator*](/docs/api/qiskit-fermions/protocols-supports-majorana-operator "qiskit_fermions.protocols.majorana_operator.SupportsMajoranaOperator")) – the operator to convert, implementing [`SupportsMajoranaOperator`](/docs/api/qiskit-fermions/protocols-supports-majorana-operator "qiskit_fermions.protocols.SupportsMajoranaOperator").

**Returns**

The operator converted into a [`MajoranaOperator`](/docs/api/qiskit-fermions/operators-majorana-operator "qiskit_fermions.operators.MajoranaOperator").

**Return type**

[*MajoranaOperator*](/docs/api/qiskit-fermions/operators-majorana-operator "qiskit_fermions.operators.majorana_operator.MajoranaOperator")

```pycon
>>> from qiskit_fermions.mappers.library import majorana_operator
>>> from qiskit_fermions.operators import FermionOperator
>>> fer_op = FermionOperator.from_dict({((True, 0), (False, 0)): 1})
>>> maj_op = majorana_operator(fer_op)
>>> print(format(maj_op.normal_ordered().simplify()))
 5.000000e-1 +0.000000e0j * ()
  0.000000e0-5.000000e-1j * (γ'0 γ0)
```