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Bulletin of the American Physical Society

Quantum simulation with two dimensional Wigner crystal in monolithic ion trap

Mu Qiao, Ye Wang, Pengfei Wang, Mark Um, Naijun Jin, Junhua Zhang, Haiyan Wang, Yipu Song, Jing-Ning Zhang, Kihwan Kim

Published May 29, 2019• 0 citations
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Quantum Simulation with 2D Arrays of Trapped Ions

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Linear strings of trapped atomic ions held in radio-frequency (rf) traps constitute one of the leading platforms for quantum simulation experiments, allowing the investigation of interacting quantum matter.However, linear ion strings have drawbacks, such as the difficulty of scaling beyond approximately 50 particles as well as the inability to naturally implement spin models with more than one spatial dimension.Here we present experiments with planar Coulomb crystals of up to 105 40 Ca + ions in a novel monolithic rf trap, laying the groundwork for quantum simulations of two-dimensional spin models with singleparticle control.We characterize the trapping potential by analysis of crystal images and compare the observed crystal configurations with numerical simulations.We further demonstrate stable confinement of large crystals, free of structural configuration changes, and find that rf heating of the crystal is not an obstacle for future quantum simulation experiments.Finally, we prepare the out-of-plane motional modes of planar crystals consisting of up to 105 ions close to their ground state by electromagnetically induced transparency cooling, an important prerequisite for implementing long-range entangling interactions.
We present a simple Paul trap that stably accommodates up to a couple of dozens of \ensuremath{^{171}\mathrm{Yb}^+~} ions in a stationary two-dimensional lattice. The trap is constructed on a single plate of gold-plated laser-machined alumina and can produce a pancake-like pseudo-potential that makes ions form a self-assembly two-dimensional crystal which locates on the plane composed of axial and one of the transverse axes with around 5 μμμm spacing. We use Raman laser beams to coherently manipulate these ion-qubits where the net propagation direction is perpendicular to the plane of the crystal and micromotion. We perform the coherent operations and study the spectrum of vibrational modes through globally addressed Raman laser-beams on a dozen of ions in the two-dimensional crystal. We measure the amplitude of micro-motion by comparing the strengths of carrier and micro-motion sideband transitions with three ions, where the micro-motion amplitude is similar to that of a single ion. The spacings of ions are small enough for large coupling strengths, which is a favorable condition for two-dimensional quantum simulation.