---
title: position (latest version)
description: API reference for qiskit_bosons.operators.library.position in the latest version of qiskit-bosons
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-bosons/operators-library-position
---

# position

`position(mode)`

Builds the dimensionless position (quadrature) operator of a single mode.

$$
\hat{q} = \frac{1}{\sqrt{2}}\left(b^\dagger + b\right) \, .
$$

```pycon
>>> from qiskit_bosons.operators.library import position
>>> position(0).is_hermitian()
True
```

**Parameters**

**mode** ([*int*](https://docs.python.org/3/builtins/functions.html#int)) – the mode index.

**Returns**

The position operator as a [`BosonOperator`](/docs/api/qiskit-bosons/operators-boson-operator "qiskit_bosons.operators.BosonOperator").

**Return type**

[*BosonOperator*](/docs/api/qiskit-bosons/operators-boson-operator "qiskit_bosons.operators.boson_operator.BosonOperator")