Two Doppler-free multiphoton schemes achieve microsecond coherent control of the 88Sr 1S0–3P0 clock transition on 3e6 free-space thermal atoms, suppressing Doppler dephasing 1000-fold versus single-photon excitation.
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Four barriers (selection rules, HFS-E2 background, second-order mixing, tensor polarizability) limit gravitomagnetic searches; generalized King plots with three transitions and sufficient odd isotopes can separate them, yielding |χ-1| ≲ 10^8-10^9 for Mo.
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Microsecond-Scale Coherent Control of a Forbidden Clock Transition with Doppler-Free Multiphoton Excitations
Two Doppler-free multiphoton schemes achieve microsecond coherent control of the 88Sr 1S0–3P0 clock transition on 3e6 free-space thermal atoms, suppressing Doppler dephasing 1000-fold versus single-photon excitation.
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Rank-2 Electromagnetic Backgrounds and Angular Momentum Barriers in Gravitomagnetic Spin-Quadrupole Searches
Four barriers (selection rules, HFS-E2 background, second-order mixing, tensor polarizability) limit gravitomagnetic searches; generalized King plots with three transitions and sufficient odd isotopes can separate them, yielding |χ-1| ≲ 10^8-10^9 for Mo.