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---
title: eigensolvers
description: API reference for qiskit.algorithms.eigensolvers
in_page_toc_min_heading_level: 2
python_api_type: module
python_api_name: qiskit.algorithms.eigensolvers
---
<span id="module-qiskit.algorithms.eigensolvers" />
<span id="qiskit-algorithms-eigensolvers" />
# qiskit.algorithms.eigensolvers
<span id="eigensolvers-package-qiskit-algorithms-eigensolvers" />
## Eigensolvers Package
<span id="module-qiskit.algorithms.eigensolvers" />
`qiskit.algorithms.eigensolvers`
### Eigensolvers
| | |
| ------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------- |
| [`Eigensolver`](qiskit.algorithms.eigensolvers.Eigensolver "qiskit.algorithms.eigensolvers.Eigensolver")() | The eigensolver interface. |
| [`NumPyEigensolver`](qiskit.algorithms.eigensolvers.NumPyEigensolver "qiskit.algorithms.eigensolvers.NumPyEigensolver")(\[k, filter\_criterion]) | The NumPy eigensolver algorithm. |
| [`VQD`](qiskit.algorithms.eigensolvers.VQD "qiskit.algorithms.eigensolvers.VQD")(estimator, fidelity, ansatz, optimizer, \*) | The Variational Quantum Deflation algorithm. |
### Results
> | | |
> | ------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------- |
> | [`EigensolverResult`](qiskit.algorithms.eigensolvers.EigensolverResult "qiskit.algorithms.eigensolvers.EigensolverResult")() | Eigensolver result. |
> | [`NumPyEigensolverResult`](qiskit.algorithms.eigensolvers.NumPyEigensolverResult "qiskit.algorithms.eigensolvers.NumPyEigensolverResult")() | NumPy eigensolver result. |
> | [`VQDResult`](qiskit.algorithms.eigensolvers.VQDResult "qiskit.algorithms.eigensolvers.VQDResult")() | VQD Result. |