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We present Quafu-Qcover, an open-source cloud-based software package designedfor combinatorial optimization problems that support both quantum simulatorsand hardware backends. Quafu-Qcover provides a standardized and completeworkflow for solving combinatorial optimization problems using the QuantumApproximate Optimization Algorithm (QAOA). It enables the automatic modeling ofthe original problem as a quadratic unconstrained binary optimization (QUBO)model and corresponding Ising model, which can be further transformed into aweight graph. The core of Qcover relies on a graph decomposition-basedclassical algorithm, which enables obtaining the optimal parameters for theshallow QAOA circuit more efficiently. Quafu-Qcover includes a specializedcompiler that translates QAOA circuits into physical quantum circuits capableof execution on Quafu cloud quantum computers. Compared to a general-purposecompiler, ours generates shorter circuit depths while also possessing betterspeed performance. The Qcover compiler can establish a library of qubitscoupling substructures in real time based on the updated calibration data ofthe superconducting quantum devices, ensuring that the task is executed onphysical qubits with higher fidelity. The Quafu-Qcover allows us to retrievequantum computer sampling result information at any time using task ID,enabling asynchronous processing. Besides, it includes modules for resultpreprocessing and visualization, allowing for an intuitive display of thesolution to combinatorial optimization problems. We hope that Quafu-Qcover canserve as a guiding example for how to explore application problems on the Quafucloud quantum computers

Quafu-Qcover: Explore Combinatorial Optimization Problems on Cloud-based Quantum Computers