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A scalable 2-local architecture for quantum annealing of all-to-all Ising models

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arXiv:2404.06861v2 Announce Type: replace
Abstract: Achieving dense connectivities is a challenge for most quantum computing platforms today, and a particularly crucial one for the case of quantum annealing applications. In this context, we present a scalable architecture for quantum annealers defined on a graph of degree $d=3$ and containing exclusively 2-local interactions to realize an all-to-all connected Ising model. This amounts to an efficient braiding of logical chains of qubits which can be derived from a description of the problem in terms of triangles. We also devise strategies to address the challenges of scalable architectures, such as the faster shrinking of the gap due to the larger physical Hilbert space, based on driver Hamiltonians more suited to the symmetries of the logical solution space. We thus show an alternative route to scale up devices dedicated to classical optimization tasks within the quantum annealing paradigm.

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