---
title: Overview
description: Overview for the latest version of Sample-based quantum diagonalization (SQD)
source: https://quantum.cloud.ibm.com/docs/en/addons/qiskit-addon-sqd/guides/overview
---

# Overview

This page summarizes the guides that are available. All guides are written to focus on specific aspects of the package. Examples of end-to-end workflows can be found in the tutorials hosted on the IBM Quantum Platform.

## Getting started

These simple guides help you to get started quickly with the package.

- [Quickstart](/docs/addons/qiskit-addon-sqd/guides/quickstart)

## Beyond the basics

These guides provide a deeper explanation of specific concepts and components from this package.

### General

- [How to choose the subspace dimension from its impact on eigenvalue estimation accuracy](/docs/addons/qiskit-addon-sqd/guides/choose-subspace-dimension)

### Fermionic systems

- [Scale SQD workflows for Fermionic systems with the Dice solver](/docs/addons/qiskit-addon-sqd/guides/integrate-dice-solver)
- [Optimize the Hamiltonian basis with orbital optimization to improve energy estimations](/docs/addons/qiskit-addon-sqd/guides/use-oo-to-optimize-hamiltonian-basis)
- [Understand open- and closed-shell options and their effect on subspace construction](/docs/addons/qiskit-addon-sqd/guides/select-open-closed-shell)
- [Augment the pool of electronic configurations using Fermionic transition operators to improve energy estimations and compute energies of excited states](/docs/addons/qiskit-addon-sqd/guides/add-fermionic-excitations-to-configuration-pool)

### Spin systems

- [Build a projected Hamiltonian matrix for qubit Hamiltonians](/docs/addons/qiskit-addon-sqd/guides/project-pauli-operators-onto-hilbert-subspaces)
- [Benchmark performance of subspace projection for qubit Hamiltonians](/docs/addons/qiskit-addon-sqd/guides/benchmark-pauli-projection)