An electromechanical Ising machine
arXiv:1505.02467 · doi:10.1126/sciadv.1600236
Abstract
Solving intractable mathematical problems in simulators composed of atoms, ions, photons or electrons has recently emerged as a subject of intense interest. Here we extend this concept to phonons that are localised in spectrally pure resonances in an electromechanical system which enables their interactions to be exquisitely fashioned via electrical means. We harness this platform to emulate the Ising Hamiltonian whose spin 1/2 particles are replicated by the phase bistable vibrations from a parametric resonance where multiple resonances play the role of a spin bath. The coupling between the mechanical pseudo spins is created by generating thermomechanical two-mode squeezed states which impart correlations between resonances that can imitate a ferromagnetic, random or an anti-ferromagnetic state on demand. These results suggest an electromechanical simulator for the Ising Hamiltonian could be built with a large number of spins with multiple degrees of coupling, a task that would overwhelm a conventional computer.
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