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

# cre

`cre(mode)`

Constructs a creation action on the bosonic mode at `mode`.

**Parameters**

**mode** ([*int*](https://docs.python.org/3/builtins/functions.html#int)) – the bosonic mode on which to act.

**Returns**

A creation [`BosonAction`](/docs/api/qiskit-bosons/operators-boson-action-boson-action "qiskit_bosons.operators.boson_action.BosonAction") on `mode`.

**Return type**

[tuple](https://docs.python.org/3/builtins/stdtypes.html#tuple)\[[bool](https://docs.python.org/3/builtins/functions.html#bool), [int](https://docs.python.org/3/builtins/functions.html#int)]