Landau-Zener-Stückelberg interference enables a reduced-parameter variational ansatz for diabatic quantum annealing that permits polynomial-time classical schedule optimization and yields numerical speedups over adiabatic methods on Ising and MAXCUT instances.
Theory of Quantum Annealing of an Ising Spin Glass
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abstract
Probing the lowest energy configuration of a complex system by quantum annealing was recently found to be more effective than its classical, thermal counterpart. Comparing classical and quantum Monte Carlo annealing protocols on the random two-dimensional Ising model we confirm the superiority of quantum annealing relative to classical annealing. We also propose a theory of quantum annealing, based on a cascade of Landau-Zener tunneling events. For both classical and quantum annealing, the residual energy after annealing is inversely proportional to a power of the logarithm of the annealing time, but the quantum case has a larger power which makes it faster
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Leveraging Landau-Zener-St\"uckelberg interference for accelerating diabatic quantum annealing
Landau-Zener-Stückelberg interference enables a reduced-parameter variational ansatz for diabatic quantum annealing that permits polynomial-time classical schedule optimization and yields numerical speedups over adiabatic methods on Ising and MAXCUT instances.