What is CUDA Quantum? ¶

CUDA Quantum is a library and compiler toolchain for programming hybrid quantum programs on both GPUs and QPUs (quantum processing units). PennyLane programs can be compiled using CUDA Quantum via the @qml.qjit decorator; for more details, see What is QJIT?.

CUDA Quantum consists of the following components:

• A C++ frontend for defining a user's quantum program workflow,
• A set of Python bindings to the C++ API,
• the nvq++ compiler, that compiles the program down to an executable, and
• various simulator and hardware backends for executing the quantum components of the workflow. Supported simulators include cuQuantum and q++.

Internally, CUDA Quantum levarages technologies such as MLIR, LLVM, and QIR as intermediate representations of the hybrid workflow, similar to other hybrid compilers such as Catalyst.