---
title: Introduction to Qiskit Function templates
description: Learn how to use and build Qiskit Function templates.
source: https://quantum.cloud.ibm.com/docs/en/guides/qiskit-function-templates
---

# Introduction to Qiskit Function templates

[Qiskit Function templates](https://github.com/qiskit-community/qiskit-function-templates) are an open-source collection of realistic code examples that give you access to some of the latest research workflows that leverage tools like the Qiskit SDK and [Qiskit addons](/docs/guides/addons). These pre-built workflows take information from practical experiments and package them in a way that you can customize and reuse in your own research so that you don't have to build from scratch. All templates are readily deployable to [Qiskit Serverless](/docs/guides/serverless) where you can easily leverage classical compute as part of your workflow.

There are two types of templates:

- *Template implementations*: Specialized code examples that implement advanced techniques from real-world experiments in areas like chemistry and physics.
- *Base templates*: References for developing your own original Qiskit Function. These templates highlight best-practices in interface development, code formatting, unit testing, and more.

## Template implementations

Qiskit Function template implementations are organized by application area. Currently included in the collection is a physics template for Hamiltonian simulation using the [AQC-Tensor Qiskit addon](https://qiskit.github.io/qiskit-addon-aqc-tensor/) and a chemistry template for electronic structure with the implicit solvent model using the [SQD Qiskit addon](/docs/addons/qiskit-addon-sqd).
Resources to get started with these two templates are available at the following links:

- Electronic structure simulation with implicit solvent model: [template source files](https://github.com/qiskit-community/qiskit-function-templates/tree/main/chemistry/sqd_pcm) and [guide](/docs/guides/function-template-chemistry-workflow)
- Hamiltonian simulation: [template source files](https://github.com/qiskit-community/qiskit-function-templates/tree/main/physics/hamiltonian_simulation) and [guide](/docs/guides/function-template-hamiltonian-simulation)

## Base templates

The *base templates* are references for developing your own original Qiskit Function. They are designed to help you kickstart the development process by illustrating best practices in interface development, code formatting, I/O handling, error messages, checkpoints, unit testing, and more. The repository is exposed as a [GitHub template](https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository) so that the CI/CD implementation can be easily extended.

There are currently two templates: a [circuit function template](https://github.com/qiskit-community/qiskit-function-templates/blob/main/base_templates/circuit_function_template.py) and an [application function template](https://github.com/qiskit-community/qiskit-function-templates/blob/main/base_templates/application_function_template.py).

## Next steps

> **Recommendations**
>
> - Review the guide on building a function template for [Hamiltonian simulation](/docs/guides/function-template-hamiltonian-simulation)
> - Read through the guide on deploying the function template for a [chemistry workflow](/docs/guides/function-template-chemistry-workflow)
> - Check out the [Qiskit Function templates repository](https://github.com/qiskit-community/qiskit-function-templates) on GitHub.