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  1. Layer-resolved state preparation and imaging is reported in highly tunable two-dimensional layers of ultracold potassium–rubidium molecules in an optical lattice.
    Free, publicly-accessible full text available March 18, 2023
  2. Free, publicly-accessible full text available March 1, 2023
  3. Free, publicly-accessible full text available December 1, 2022
  4. Transition rates between coupled states in a quantum system depend on the density of available final states. The radiative decay of an excited atomic state has been suppressed by reducing the density of electromagnetic vacuum modes near the atomic transition. Likewise, reducing the density of available momentum modes of the atomic motion when it is embedded inside a Fermi sea will suppress spontaneous emission and photon scattering rates. Here we report the experimental demonstration of suppressed light scattering in a quantum degenerate Fermi gas. We systematically measured the dependence of the suppression factor on the temperature and Fermi energy ofmore »a strontium quantum gas and achieved suppression of scattering rates by up to a factor of 2 compared with a thermal gas.« less
    Free, publicly-accessible full text available November 19, 2022
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  6. Free, publicly-accessible full text available October 1, 2022
  7. Breath analysis enables rapid, noninvasive diagnostics, as well as long-term monitoring of human health, through the identification and quantification of exhaled biomarkers. Here, we demonstrate the remarkable capabilities of mid-infrared (mid-IR) cavity-enhanced direct-frequency comb spectroscopy (CE-DFCS) applied to breath analysis. We simultaneously detect and monitor as a function of time four breath biomarkers—CH3OH,CH4,H2O, and HDO—as well as illustrate the feasibility of detecting at least six more (H2CO,C2H6, OCS,C2H4,CS2, andNH3) without modifications to the experimental apparatus. We achieve ultrahighmore »detection sensitivity at the parts-per-trillion level. This is made possible by the combination of the broadband spectral coverage of a frequency comb, the high spectral resolution afforded by the individual comb teeth, and the sensitivity enhancement resulting from a high-finesse cavity. Exploiting recent advances in frequency comb, optical coating, and photodetector technologies, we can access a large variety of biomarkers with strong carbon–hydrogen-bond spectral signatures in the mid-IR.

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