Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock

Abstract

Optical atomic clocks promise timekeeping at the highest precision and accuracy, owing to their high operating frequencies. Rigorous evaluations of these clocks require direct comparisons between them. We have realized a high-performance remote comparison of optical clocks over km-scale urban distances, a key step for development, dissemination, and application of these optical standards. Through this remote comparison and a proper design of lattice-confined neutral atoms for clock operation, we evaluate the uncertainty of a strontium (Sr) optical lattice clock at the 1x10-16 fractional level, surpassing the best current evaluations of cesium (Cs) primary standards. We also report on the observation of density-dependent effects in the spin-polarized fermionic sample and discuss the current limiting effect of blackbody radiation-induced frequency shifts.

To be published in Science, 2008

References in corpus (10)

• Compact, thermal-noise-limited optical cavity for diode laser stabilization at 1 x 10-15
• Multipolar theory of black-body radiation shift of atomic energy levels and its implications for optical lattice clocks
• Nuclear Spin Effects in Optical Lattice Clocks
• ${}^{87}$Sr lattice clock with inaccuracy below 10${}^{-15}$
• Optical atomic coherence at the one-second time scale
• Spectroscopic insensitivity to cold collisions in a two-state mixture of fermions
• Coherent optical phase transfer over a 32-km fiber with 1-s instability at $10^{-17}$
• Improved frequency measurement of a one-dimensional optical lattice clock with a spin-polarized fermionic ${}^{87}$Sr isotope
• An Optical Lattice Clock with Spin-polarized 87Sr Atoms
• Long Distance Transport of Ultracold Atoms using a 1D optical lattice

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