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

Cited by in corpus (58)

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• Ultracold Fermi Gases with Emergent SU(N) Symmetry
• Quantum computing with alkaline earth atoms
• Progress in Atomic Fountains at LNE-SYRTE
• Real-time geopotentiometry with synchronously linked optical lattice clocks
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• Tuning the Thermal Expansion Properties of Optical Reference Cavities with Fused Silica Mirrors
• An atomic clock with $1\times 10^{-18}$ room-temperature blackbody Stark uncertainty
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• Quantum improvement of time transfer between remote clocks
• Doppler-free spectroscopy of the 1S0-3P0 optical clock transition in laser-cooled fermionic isotopes of neutral mercury
• Frequency ratios of Sr, Yb and Hg based optical lattice clocks and their applications
• Frequency evaluation of the doubly forbidden ${}^1{S}_0{\to }^3{P}_0$ transition in bosonic ${}^{174}$Yb
• Searches for topological defect dark matter via non-gravitational signatures
• Determination of the 5d6s 3D1 state lifetime and blackbody radiation clock shift in Yb
• Fourier-transform spectroscopy of Sr2 and revised ground state potential
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• Spin squeezing in optical lattice clocks via lattice-based QND measurements
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• Prospects for application of ultracold Sr${}_2$ molecules in precision measurements
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• Colloquium: Comparison of Astrophysical and Terrestrial Frequency Standards
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• A high stability semiconductor laser system for a ${}^{88}$Sr-based optical lattice clock
• Detuning Enhanced Cavity Spin Squeezing
• Absolute frequency measurement of the magnesium intercombination transition ${}^1{S}_0{\to }^3{P}_1$
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• Formation of deeply bound ultracold Sr_2 molecules by photoassociation near the ^1S + ^3P_1 intercombination line
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• Magic radio-frequency dressing of nuclear spins in high-accuracy optical clocks
• Perspectives for coherent optical formation of strontium molecules in their electronic ground state
• Robustness of Heisenberg-limited interferometry with balanced Fock states
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• Absolute frequency measurement of the 7s${}^2$ ${}^1$S${}_0$ $-$ 7s7p ${}^1$P${}_1$ transition in ${}^{225}$Ra
• A simplified method for calculating the ac Stark shift of hyperfine levels
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• Full Nonlinear Conversion of Broadband Frequency Combs generated by Four-Wave Mixing in Highly Nonlinear Fibers
• Tackling the blackbody shift in a strontium optical lattice clock
• Engineering the quantum transport of atomic wavefunctions over macroscopic distances
• Dissemination stability and phase noise specification of fiber-cascaded RF frequency dissemination