# VQE, Ansatzes, and ADAPT

VQE uses the variational objective {eq}`eq-vqe-objective` from the theory
overview. The sections below cover the core VQE loop, ansatz choices,
optimizers, fermion-to-qubit mappings, and adaptive ansatz growth.

```{include} ../../THEORY.md
:start-after: "# VQE Overview"
:end-before: "# Excited-State Methods"
:heading-offset: 1
```

## ADAPT-VQE

```{include} ../../THEORY.md
:start-after: "# ADAPT-VQE"
:end-before: "# Quantum Phase Estimation"
:heading-offset: 1
```