qadence 0.9.1

Pasqal interface for circuit-based quantum computing SDKs

Qadence

Qadence is a Python package that provides a simple interface to build digital-analog quantum programs with tunable qubit interaction defined on arbitrary register topologies realizable on neutral atom devices.

Documentation can be found here.

Feature highlights

• A block-based system for composing complex digital-analog programs in a flexible and scalable manner, inspired by the Julia quantum SDK Yao.jl and functional programming concepts.

• A simple interface to work with interacting neutral-atom qubit systems using arbitrary registers topologies.

• An intuitive expression-based system developed on top of the symbolic library Sympy to construct parametric quantum programs easily.

• [High-order generalized parameter shift rules](link to psr tutorial) for differentiating parametrized quantum operations.

• Out-of-the-box automatic differentiability of quantum programs with PyTorch integration.

• Efficient execution on a variety of different purpose backends: from state vector simulators to tensor network emulators and real devices.

Installation guide

Qadence can be installed from PyPI with pip as follows:

pip install qadence

The default backend for Qadence is PyQTorch, a differentiable state vector simulator for digital-analog simulation. It is possible to install additional backends and the circuit visualization library using the following extras:

• braket: the Braket backend.
• pulser: the Pulser backend for composing, simulating and executing pulse sequences for neutral-atom quantum devices.
• visualization: to display diagrammatically quantum circuits.

by running:

pip install qadence[braket, pulser, visualization]

!!! warning In order to correctly install the visualization extra, the graphviz package needs to be installed in your system:

```bash
# on Ubuntu
sudo apt install graphviz

# on MacOS
brew install graphviz

# via conda
conda install python-graphviz
```

Citation

If you use Qadence for a publication, we kindly ask you to cite our work using the following BibTex entry:

@misc{qadence2023pasqal,
  url = {https://github.com/pasqal-io/qadence},
  title = {Qadence: {A} {D}igital-analog quantum programming interface.},
  year = {2023}
}