Polarization-gradient cooling of 1D and 2D ion Coulomb crystals. (8th October 2020)

• Record Type: Journal Article
• Authors: Joshi, M K; Fabre, A; Maier, C; Brydges, T; Kiesenhofer, D; Hainzer, H; Blatt, R; Roos, C F
• Is Part Of: New journal of physics. Volume 22:Number 10(2020:Oct.)
• Publication Date: 2020-10-08
• Subjects: trapped ions -- ion crystals -- laser cooling -- polarization gradient cooling -- quantum simulation; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/abb912
• Languages: English
• ISSNs: 1367-2630

Abstract

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 ↔ 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.