EPJ Quantum Technol. (2015) 2: 2
https://doi.org/10.1140/epjqt14

Research

Creation of two-dimensional Coulomb crystals of ions in oblate Paul traps for quantum simulations

⁷ Department of Physics, Georgetown University, 37th and O St. NW, Washington, DC, 20007, USA
⁸ Department of Physics and Astronomy, Washington University, Campus Box 1105, One Brookings Dr., St. Louis, Missouri, 63130, USA
⁹ Department of Physics and Astronomy, University of California Los Angeles, 475 Portola Plaza, Los Angeles, CA, 90095, USA

^* e-mail: bty4@georgetown.edu

Received: 2 June 2014
Accepted: 22 October 2014
Published online: 4 January 2015

Abstract

We develop the theory to describe the equilibrium ion positions and phonon modes for a trapped ion quantum simulator in an oblate Paul trap that creates two-dimensional Coulomb crystals in a triangular lattice. By coupling the internal states of the ions to laser beams propagating along the symmetry axis, we study the effective Ising spin-spin interactions that are mediated via the axial phonons and are less sensitive to ion micromotion. We find that the axial mode frequencies permit the programming of Ising interactions with inverse power law spin-spin couplings that can be tuned from uniform to r^-3 with DC voltages. Such a trap could allow for interesting new geometrical configurations for quantum simulations on moderately sized systems including frustrated magnetism on triangular lattices or Aharonov-Bohm effects on ion tunneling. The trap also incorporates periodic boundary conditions around loops which could be employed to examine time crystals.