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---
title: QuantumAlgorithm (v0.26)
description: API reference for qiskit.aqua.algorithms.QuantumAlgorithm in qiskit v0.26
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.aqua.algorithms.QuantumAlgorithm
---
<span id="qiskit-aqua-algorithms-quantumalgorithm" />
# qiskit.aqua.algorithms.QuantumAlgorithm
<Class id="qiskit.aqua.algorithms.QuantumAlgorithm" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-aqua/tree/stable/0.9/qiskit/aqua/algorithms/quantum_algorithm.py" signature="QuantumAlgorithm(quantum_instance)" modifiers="class">
Base class for Quantum Algorithms.
This method should initialize the module and use an exception if a component of the module is available.
### \_\_init\_\_
<Function id="qiskit.aqua.algorithms.QuantumAlgorithm.__init__" signature="__init__(quantum_instance)" modifiers="abstract">
Initialize self. See help(type(self)) for accurate signature.
</Function>
## Methods
| | |
| ------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------- |
| [`__init__`](#qiskit.aqua.algorithms.QuantumAlgorithm.__init__ "qiskit.aqua.algorithms.QuantumAlgorithm.__init__")(quantum\_instance) | Initialize self. |
| [`run`](#qiskit.aqua.algorithms.QuantumAlgorithm.run "qiskit.aqua.algorithms.QuantumAlgorithm.run")(\[quantum\_instance]) | Execute the algorithm with selected backend. |
| [`set_backend`](#qiskit.aqua.algorithms.QuantumAlgorithm.set_backend "qiskit.aqua.algorithms.QuantumAlgorithm.set_backend")(backend, \*\*kwargs) | Sets backend with configuration. |
## Attributes
| | |
| ------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------- |
| [`backend`](#qiskit.aqua.algorithms.QuantumAlgorithm.backend "qiskit.aqua.algorithms.QuantumAlgorithm.backend") | Returns backend. |
| [`quantum_instance`](#qiskit.aqua.algorithms.QuantumAlgorithm.quantum_instance "qiskit.aqua.algorithms.QuantumAlgorithm.quantum_instance") | Returns quantum instance. |
| [`random`](#qiskit.aqua.algorithms.QuantumAlgorithm.random "qiskit.aqua.algorithms.QuantumAlgorithm.random") | Return a numpy random. |
### backend
<Attribute id="qiskit.aqua.algorithms.QuantumAlgorithm.backend">
Returns backend.
**Return type**
`Union`\[`Backend`, `BaseBackend`]
</Attribute>
### quantum\_instance
<Attribute id="qiskit.aqua.algorithms.QuantumAlgorithm.quantum_instance">
Returns quantum instance.
**Return type**
`Optional`\[`QuantumInstance`]
</Attribute>
### random
<Attribute id="qiskit.aqua.algorithms.QuantumAlgorithm.random">
Return a numpy random.
</Attribute>
### run
<Function id="qiskit.aqua.algorithms.QuantumAlgorithm.run" signature="run(quantum_instance=None, **kwargs)">
Execute the algorithm with selected backend.
**Parameters**
* **quantum\_instance** (`Union`\[`QuantumInstance`, `Backend`, `BaseBackend`, `None`]) the experimental setting.
* **kwargs** (*dict*) kwargs
**Returns**
results of an algorithm.
**Return type**
dict
**Raises**
[**AquaError**](qiskit.aqua.AquaError "qiskit.aqua.AquaError") If a quantum instance or backend has not been provided
</Function>
### set\_backend
<Function id="qiskit.aqua.algorithms.QuantumAlgorithm.set_backend" signature="set_backend(backend, **kwargs)">
Sets backend with configuration.
**Return type**
`None`
</Function>
</Class>