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Creators/Authors contains: "Hutson, Ross B."

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  1. ; ; ; ; ( , Science)

    Collective couplings of atomic dipoles to a shared electromagnetic environment produce a wide range of many-body phenomena. We report on the direct observation of resonant electric dipole-dipole interactions in a cubic array of atoms in the many-excitation limit. The interactions produce spatially dependent cooperative Lamb shifts when spectroscopically interrogating the millihertz-wide optical clock transition in strontium-87. We show that the ensemble-averaged shifts can be suppressed below the level of evaluated systematic uncertainties for optical atomic clocks. Additionally, we demonstrate that excitation of the atomic dipoles near a Bragg angle can enhance these effects by nearly an order of magnitude compared with nonresonant geometries. Our work demonstrates a platform for precise studies of the quantum many-body physics of spins with long-range interactions mediated by propagating photons.

     
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    Free, publicly-accessible full text available January 26, 2025
  2. ; ; ; ; ( , Physical Review A)
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  3. ; ; ; ; ( , Physical Review Letters)
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  4. ; ; ; ; ; ( , Science)
    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 of a strontium quantum gas and achieved suppression of scattering rates by up to a factor of 2 compared with a thermal gas. 
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  5. ; ; ; ; ; ; ; ; ( , Physical Review Letters)
  6. ; ; ; ; ; ; ; ; ( , Nature Physics)
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  9. ; ; ; ; ; ; ; ; ( , Physical Review X)
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