Pennylane

Pennylane is a cross-platform Python library for quantum computing, quantum machine learning, and quantum chemistry. It enables building and training quantum circuits with automatic differentiation, seamless integration with PyTorch/JAX/TensorFlow, and device-independent execution across simulators and quantum hardware including IBM, Amazon Braket, Google, Rigetti, and IonQ. Use this library when working with quantum circuits, variational quantum algorithms (VQE, QAOA), quantum neural networks, hybrid quantum-classical models, molecular simulations, quantum chemistry calculations, or any quantum computing tasks requiring gradient-based optimization, hardware-agnostic programming, or quantum machine learning workflows.