High-accuracy optical clock via three-level coherence in neutral bosonic Sr-88

摘要

An optical atomic clock scheme is proposed that utilizes two lasers to establish coherent coupling\ud\udbetween the 5s2 1S0 ground state of 88Sr and the first excited state, 5s5p 3P0. The coupling is mediated by\ud\udthe broad 5s5p 1P1 state, exploiting the phenomenon of electromagnetically induced transparency. The\ud\udeffective linewidth of the clock transition can be chosen at will by adjusting the laser intensity. By trapping\ud\udthe 88Sr atoms in an optical lattice, long interaction times with the two lasers are ensured; Doppler and\ud\udrecoil effects are eliminated. Based on a careful analysis of systematic errors, a clock accuracy of better\ud\udthan 2 1017 is expected.