Related papers: Optical super-resolution sensing of a trapped ion's wave packet size

Optical super-resolution sensing of a trapped ion's wave packet size

URL: http://arxiv.org/abs/2104.07095v2
Date: Thu, 7 Oct 2021 14:59:48 GMT
Title: Optical super-resolution sensing of a trapped ion's wave packet size
Authors: Martin Drechsler, Sebastian Wolf, Christian T. Schmiegelow, Ferdinand Schmidt-Kaler
Abstract summary: We demonstrate super-resolution optical sensing of the size of the wave packet of a single trapped ion. Our method extends the well known ground state depletion (GSD) technique to the coherent regime.
Score: 26.98676199482944
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We demonstrate super-resolution optical sensing of the size of the wave packet of a single trapped ion. Our method extends the well known ground state depletion (GSD) technique to the coherent regime. Here, we use a hollow beam to strongly saturate a coherently driven dipole-forbidden transition around a sub-diffraction limited area at its center and observe state dependent fluorescence. By spatially scanning this laser beam over a single trapped $^{40}\mathrm{Ca}^+$ ion, we are able to measure the wave packet sizes of cooled ions. Using a depletion beam waist of $4.2(1)\,\mu$m we reach a spatial resolution which allows us to determine a wave packet size of $39(9)\,$nm for a near ground state cooled ion. This value matches an independently deduced value of $32(2)\,$nm, calculated from resolved sideband spectroscopy measurements. Finally, we discuss the ultimate resolution limits of our adapted GSD imaging technique in view of applications to direct quantum wave packet imaging.

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