Related papers: $Λ$-enhanced gray-molasses loading and EIT cooling of neutral atoms in nanophotonic traps

$Λ$-enhanced gray-molasses loading and EIT cooling of neutral atoms in nanophotonic traps

URL: http://arxiv.org/abs/2605.13387v1
Date: Wed, 13 May 2026 11:45:32 GMT
Title: $Λ$-enhanced gray-molasses loading and EIT cooling of neutral atoms in nanophotonic traps
Abstract summary: Gray-molasses can substantially increase the number of trapped atoms in a nanofiber-based cold-atom setup.<n>We load about 4000 individual Cesium atoms, achieving optical depths exceeding 140.<n>EIT-cooling also works with two co-propagating nanofiber-guided light fields and requiries only about a few hundred picowatt of optical power.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Nanophotonic traps for cold atoms typically have trap volumes that are orders of magnitude smaller than, e.g., free-space optical tweezers. This makes efficient loading of these traps challenging, thereby limiting the total number of atoms coupled to the nanophotonic waveguide. Here, we demonstrate that $Λ$-enhanced gray-molasses ($Λ$GM) can substantially increase the number of trapped atoms in a nanofiber-based cold-atom setup. Specifically, we observe a six-fold increase in the number of loaded atoms compared to conventional red-detuned polarization gradient cooling. Despite the unusually small depth of our optical trap of only 24 $μ$K, we load about 4000 individual Cesium atoms, achieving optical depths exceeding 140 and reaching the collisional blockade regime over a length of approximately 1 mm. After loading, we perform efficient EIT-assisted cooling that is found to increase the trap storage time to 400(9) ms. This is a 5-fold improvement over the passive storage time. Remarkably, EIT-cooling also works with two co-propagating nanofiber-guided light fields and requiries only about a few hundred picowatt of optical power. Our results provide an efficient method to boost both the number of loaded atoms and the storage time of nanophotonic atom traps.

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