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

NEW JOURNAL OF PHYSICS(2020)

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摘要
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 theS(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.
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关键词
trapped ions,ion crystals,laser cooling,polarization gradient cooling,quantum simulation
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