Polarization-gradient cooling of 1D and 2D ion Coulomb crystals

2020/06/30 by M. K. Joshi, A. Fabre, C. Maier +5 · 1 citation
Physics and Astronomy · #quant-ph #physics.atom-ph

paper · pdf · doi:10.1088/1367-2630/abb912

published as New J. Phys. 22, 103013 (2020)

arxiv created 2020/08/26 · arxiv updated 2020/10/12

Abstract

We present experiments on polarization gradient cooling of Ca⁺ multi-ion Coulomb crystals in a linear Paul trap. Polarization gradient cooling of the collective modes of motion whose eigenvectors have overlap with the symmetry axis of the trap is achieved by two counter-propagating laser beams with mutually orthogonal linear polarizations that are blue-detuned from the S_1/2 to P_1/2 transition. We demonstrate cooling of linear chains of up to 51 ions and 2D-crystals in zig-zag configuration with 22 ions. The cooling results are compared with numerical simulations and the predictions of a simple model of cooling in a moving polarization gradient.

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