A coherent quantum annealer with Rydberg atoms

A. W. Glaetzle (), R. M. W. van Bijnen, P. Zoller and W. Lechner ()
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A. W. Glaetzle: Institute for Theoretical Physics, University of Innsbruck
R. M. W. van Bijnen: Institute for Theoretical Physics, University of Innsbruck
P. Zoller: Institute for Theoretical Physics, University of Innsbruck
W. Lechner: Institute for Theoretical Physics, University of Innsbruck

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract There is a significant ongoing effort in realizing quantum annealing with different physical platforms. The challenge is to achieve a fully programmable quantum device featuring coherent adiabatic quantum dynamics. Here we show that combining the well-developed quantum simulation toolbox for Rydberg atoms with the recently proposed Lechner–Hauke–Zoller (LHZ) architecture allows one to build a prototype for a coherent adiabatic quantum computer with all-to-all Ising interactions and, therefore, a platform for quantum annealing. In LHZ an infinite-range spin-glass is mapped onto the low energy subspace of a spin-1/2 lattice gauge model with quasi-local four-body parity constraints. This spin model can be emulated in a natural way with Rubidium and Caesium atoms in a bipartite optical lattice involving laser-dressed Rydberg–Rydberg interactions, which are several orders of magnitude larger than the relevant decoherence rates. This makes the exploration of coherent quantum enhanced optimization protocols accessible with state-of-the-art atomic physics experiments.

Date: 2017
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DOI: 10.1038/ncomms15813

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