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Bulletin of the American Physical Society

Coupled Qubits for Next Generation Quantum Annealing: Improving Coherence

Steven J. Weber, Gabriel Samach, David J. Hover, Danna Rosenberg, Jonilyn Yoder, David K. Kim, Andrew J. Kerman, William D. Oliver

Published Mar 13, 2017• 0 citations
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Although quantum annealing has received considerable interest as a potential computing paradigm, it has not met the key criterion of improved scaling over classical methods. Qubit coherence is currently a major limitation. Starting from a detailed theoretical understanding of the system, the authors demonstrate tunably coupled flux qubits with a circuit geometry similar to those used in existing annealers, but with coherence times that are roughly two orders of magnitude longer. Their design concepts are not limited to superconducting qubits, and could be generalized to other types being considered for quantum annealing.
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By analyzing the characteristics of hardware-native Ising Models and their performance on current and next generation quantum annealers, we provide a framework for determining the prospect of advantage utilizing adiabatic evolution compared to classical heuristics like simulated annealing. We conduct Ising Model experiments with coefficients drawn from a variety of different distributions and provide a range for the necessary moments of the distributions that lead to frustration in classical heuristics. By identifying the relationships between the linear and quadratic terms of the models, analysis can be done a priori to determine problem instance suitability on annealers. We then extend these experiments to a prototype of D-Wave's next generation device, showing further performance improvements compared to the current Advantage annealers.