International Workshop on Ultracold Group II Atoms

Session

Session 4

23 févr. 2016, 14:30

Paris

12. Remote frequency comparison of cryogenic optical lattice clocks

Dr Tetsushi Takano (The University of Tokyo)

23/02/2016 14:30

Invited talk

The accuracy of recent optical lattice clocks reaches to 10^-18 level, which allows us to explore cm-level distortion of time and space. The remote comparison of such clocks is of great importance in fundamental physics, such as, gravitational measurement³, geodesy⁴, and dark matter search⁵. Here we report a remote frequency comparison of...

15. Improved Sr clock total uncertainty and development of a degenerate, 3D lattice clock

Dr G. Edward Marti (JILA, NIST, CU Boulder)

23/02/2016 15:00

Invited talk

Abstract: We report on improvements to the accuracy and stability of the JILA Sr clock, reaching a total fractional clock uncertainty of 2e-18, primarily by reducing the uncertainties due to the optical lattice and blackbody radiation. The blackbody radiation shift was determined through accurate thermometry, with in vacuum thermometers traceable to the NIST ITS-90 temperature scale, and an...

21. Experiments with Sr lattice clocks at PTB

Dr Christian Lisdat (Physikalisch-Technische Bundesanstalt)

23/02/2016 15:30

Invited talk

I will report the ongoing activities and plans concerning our two strontium lattice clocks at PTB. In our stationary laboratory clock system we now can achieve clock instabilities of $1.6 \times 10^{-16}/(\tau/{\rm s})^{1/2}$. We deduce this from a noise model of our clock [1], which we compare with instabilities observed when measuring systematic frequency shifts in interleaved mode. Though...