A Fermi-degenerate three-dimensional optical lattice clock

作者：Campbell, S. L.; Hutson, R. B.; Marti, G. E.; Goban, A.; Oppong, N. Darkwah; McNally, R. L.; Sonderhouse, L.; Robinson, J. M.; Zhang, W.; Bloom, B. J.; Ye, J.^*

来源：Science, 2017, 358(6359): 90-93.

DOI：10.1126/science.aam5538

• SPIN-EXCHANGE INTERACTIONS
• MOTT INSULATOR
• ATOMIC CLOCK
• GAS

Strontium optical lattice clocks have the potential to simultaneously interrogate millions of atoms with a high spectroscopic quality factor of 4 x 10(17). Previously, atomic interactions have forced a compromise between clock stability, which benefits from a large number of atoms, and accuracy, which suffers from density-dependent frequency shifts. Here we demonstrate a scalable solution that takes advantage of the high, correlated density of a degenerate Fermi gas in a three-dimensional (3D) optical lattice to guard against on-site interaction shifts. We show that contact interactions are resolved so that their contribution to clock shifts is orders of magnitude lower than in previous experiments. A synchronous clock comparison between two regions of the 3D lattice yields a measurement precision of 5 x 10(-19) in 1 hour of averaging time.

• 出版日期2017-10-6