# Amazon Braket Default Simulator
[](https://pypi.python.org/pypi/amazon-braket-default-simulator)
[](https://pypi.python.org/pypi/amazon-braket-default-simulator)
[](https://github.com/amazon-braket/amazon-braket-default-simulator-python/actions/workflows/python-package.yml)
[](https://codecov.io/gh/amazon-braket/amazon-braket-default-simulator-python)
[](https://amazon-braket-default-simulator-python.readthedocs.io/en/latest/?badge=latest)
The Amazon Braket Default Simulator is a Python open source library that provides an implementation of a quantum simulator
that you can run locally. You can use the simulator to test quantum tasks that you construct for the [Amazon Braket SDK](https://github.com/amazon-braket/amazon-braket-sdk-python)
before you submit them to the Amazon Braket service for execution.
## Setting up Amazon Braket Default Simulator Python
You must have the [Amazon Braket SDK](https://github.com/amazon-braket/amazon-braket-sdk-python) installed to use the local simulator.
Follow the instructions in the [README](https://github.com/amazon-braket/amazon-braket-sdk-python/blob/main/README.md) for setup.
**Checking the version of the default simulator**
You can check your currently installed version of `amazon-braket-default-simulator` with `pip show`:
```bash
pip show amazon-braket-default-simulator
```
or alternatively from within Python:
```
>>> from braket import default_simulator
>>> default_simulator.__version__
```
## Usage
The quantum simulator implementations `StateVectorSimulator` and `DensityMatrixSimulator` plug into the `LocalSimulator` interface in
[Amazon Braket SDK](https://github.com/amazon-braket/amazon-braket-sdk-python), with the `backend` parameters as `"braket_sv"` and `"braket_dm"`, respectively.
Alternatively, to use `StateVectorSimulator`, you can instantiate `LocalSimulator` with no arguments or with `backend="default"`:
**Executing a circuit using the default simulator**
```python
from braket.circuits import Circuit
from braket.devices import LocalSimulator
device = LocalSimulator()
bell = Circuit().h(0).cnot(0, 1)
print(device.run(bell, shots=100).result().measurement_counts)
```
## Documentation
Detailed documentation, including the API reference, can be found on [Read the Docs](https://amazon-braket-default-simulator-python.readthedocs.io/en/latest/)
**To generate the API Reference HTML in your local environment**
First, install tox:
```bash
pip install tox
```
To generate the HTML, first change directories (`cd`) to position the cursor in the `amazon-braket-default-simulator-python` directory. Then, run the following command to generate the HTML documentation files:
```bash
tox -e docs
```
To view the generated documentation, open the following file in a browser:
`../amazon-braket-default-simulator-python/build/documentation/html/index.html`
## Testing
If you want to contribute to the project, be sure to run unit tests and get a successful result
before you submit a pull request. To run the unit tests, first install the test dependencies using the following command:
```bash
pip install -e "amazon-braket-default-simulator-python[test]"
```
To run the unit tests:
```bash
tox -e unit-tests
```
You can also pass in various pytest arguments to run selected tests:
```bash
tox -e unit-tests -- your-arguments
```
For more information, please see [pytest usage](https://docs.pytest.org/en/stable/usage.html).
To run linters and doc generators and unit tests:
```bash
tox
```
To run the performance tests:
```bash
tox -e performance-tests
```
These tests will compare the performance of a series of simulator executions for your changes against the latest commit on the main branch.
*Note*: The execution times for the performance tests are affected by the other processes running on the system.
In order to get stable results, stop other applications when running these tests.
## License
This project is licensed under the Apache-2.0 License.
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"description": "# Amazon Braket Default Simulator\n\n[](https://pypi.python.org/pypi/amazon-braket-default-simulator)\n[](https://pypi.python.org/pypi/amazon-braket-default-simulator)\n[](https://github.com/amazon-braket/amazon-braket-default-simulator-python/actions/workflows/python-package.yml)\n[](https://codecov.io/gh/amazon-braket/amazon-braket-default-simulator-python)\n[](https://amazon-braket-default-simulator-python.readthedocs.io/en/latest/?badge=latest)\n\nThe Amazon Braket Default Simulator is a Python open source library that provides an implementation of a quantum simulator \nthat you can run locally. You can use the simulator to test quantum tasks that you construct for the [Amazon Braket SDK](https://github.com/amazon-braket/amazon-braket-sdk-python)\nbefore you submit them to the Amazon Braket service for execution.\n\n## Setting up Amazon Braket Default Simulator Python\nYou must have the [Amazon Braket SDK](https://github.com/amazon-braket/amazon-braket-sdk-python) installed to use the local simulator.\nFollow the instructions in the [README](https://github.com/amazon-braket/amazon-braket-sdk-python/blob/main/README.md) for setup.\n\n**Checking the version of the default simulator**\n\nYou can check your currently installed version of `amazon-braket-default-simulator` with `pip show`:\n\n```bash\npip show amazon-braket-default-simulator\n```\n\nor alternatively from within Python:\n\n```\n>>> from braket import default_simulator\n>>> default_simulator.__version__\n```\n\n## Usage\nThe quantum simulator implementations `StateVectorSimulator` and `DensityMatrixSimulator` plug into the `LocalSimulator` interface in \n[Amazon Braket SDK](https://github.com/amazon-braket/amazon-braket-sdk-python), with the `backend` parameters as `\"braket_sv\"` and `\"braket_dm\"`, respectively.\nAlternatively, to use `StateVectorSimulator`, you can instantiate `LocalSimulator` with no arguments or with `backend=\"default\"`: \n\n**Executing a circuit using the default simulator**\n```python\nfrom braket.circuits import Circuit\nfrom braket.devices import LocalSimulator\n\ndevice = LocalSimulator()\n\nbell = Circuit().h(0).cnot(0, 1)\nprint(device.run(bell, shots=100).result().measurement_counts)\n```\n\n## Documentation\n\nDetailed documentation, including the API reference, can be found on [Read the Docs](https://amazon-braket-default-simulator-python.readthedocs.io/en/latest/)\n\n**To generate the API Reference HTML in your local environment**\n\nFirst, install tox:\n\n```bash\npip install tox\n```\n\nTo generate the HTML, first change directories (`cd`) to position the cursor in the `amazon-braket-default-simulator-python` directory. Then, run the following command to generate the HTML documentation files:\n\n```bash\ntox -e docs\n```\n\nTo view the generated documentation, open the following file in a browser:\n`../amazon-braket-default-simulator-python/build/documentation/html/index.html`\n\n## Testing\n\nIf you want to contribute to the project, be sure to run unit tests and get a successful result \nbefore you submit a pull request. To run the unit tests, first install the test dependencies using the following command:\n\n```bash\npip install -e \"amazon-braket-default-simulator-python[test]\"\n```\n\nTo run the unit tests:\n\n```bash\ntox -e unit-tests\n```\n\nYou can also pass in various pytest arguments to run selected tests:\n\n```bash\ntox -e unit-tests -- your-arguments\n```\n\nFor more information, please see [pytest usage](https://docs.pytest.org/en/stable/usage.html).\n\nTo run linters and doc generators and unit tests:\n\n```bash\ntox\n```\n\nTo run the performance tests:\n\n```bash\ntox -e performance-tests\n```\n\nThese tests will compare the performance of a series of simulator executions for your changes against the latest commit on the main branch.\n*Note*: The execution times for the performance tests are affected by the other processes running on the system.\nIn order to get stable results, stop other applications when running these tests.\n\n## License\n\nThis project is licensed under the Apache-2.0 License.\n\n",
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