TY - JOUR
KW - Multidisciplinary
AU - Ross Hutson
AU - William Milner
AU - Lingfeng Yan
AU - Jun Ye
AU - Christian Sanner
AB - <jats:p>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.</jats:p>
BT - Science
DA - 2024-01
DO - 10.1126/science.adh4477
IS - 6681
N2 - <jats:p>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.</jats:p>
PB - American Association for the Advancement of Science (AAAS)
PY - 2024
SP - 384
EP - 387
T2 - Science
TI - Observation of millihertz-level cooperative Lamb shifts in an optical atomic clock
VL - 383
SN - 0036-8075, 1095-9203
ER -