1.
Opt Express
; 27(26): 38359-38366, 2019 Dec 23.
Artigo
em Inglês
| MEDLINE
| ID: mdl-31878604
RESUMO
Clocks based on cold atoms offer unbeatable accuracy and long-term stability, but their use in portable quantum technologies is hampered by a large physical footprint. Here, we use the compact optical layout of a grating magneto-optical trap (gMOT) for a precise frequency reference. The gMOT collects 107 87Rb atoms, which are subsequently cooled to 20 µK in optical molasses. We optically probe the microwave atomic ground-state splitting using linâ¥lin polarised coherent population trapping and a Raman-Ramsey sequence. With ballistic drop distances of only 0.5â mm, the measured short-term fractional frequency stability is 2×10-11/τ.