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# QAOA

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  1. arXiv

    GPT-6 Astra writes variational quantum circuit angles directly: no optimizer, 95–100% of the VQE spectrum

    Variational quantum algorithms normally rely on a classical optimizer to tune gate angles, and every loss evaluation is a run of the quantum device. A study has the frontier model GPT-6 Astra write the angles directly from the problem, circuit and gate conventions, with no loss or gradient returned; on transverse-field Ising chains, H2 and depth-one QAOA its angles match the optimizer, and as a warm start they cut the median optimizer evaluations to best value down to one.

  2. Quantum samplers fail to fill the classical repair basin: tabu search leads at 0.82–0.94 basin mass in a preregistered test

    After porting the quantum-chemistry pipeline of a generative model writing circuits, a quantum sampler drawing bitstrings, classical repair expanding them and a classical solver picking the best, to maximum weighted independent set, a preregistered held-out test returns a negative answer: tabu search reaches repair-basin mass 0.82–0.94 and simulated annealing comes second, while every quantum sampler and a matched learned classical policy trails both at every size. An earlier positive-looking result came from picking the best of 50 configurations per instance, an upper bound rather than a deployable method; under random configurations, oracle QAOA reaches only 0.014 at n=28.

  3. arXiv

    Modular benchmark decouples quantum search-direction estimation from classical update rules, finding the best update rule depends on estimator and workload

    The work presents a modular benchmarking framework that independently pairs search-direction estimators for parameterized quantum circuits (parameter-shift, finite differences, SPSA, PGPE, observable-curvature preconditioning) with classical update rules (SGD, Adam, RMSprop), evaluating them on MaxCut QAOA, Iris classification, a binary-MNIST QCNN, and molecular-hydrogen VQE under 256-shot finite-sampling simulation plus selected case studies on a 156-qubit processor; results show the preferred update rule depends on the estimator and workload, and that peak and across-seed average performance often favor different configurations.

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