Measuring absolute frequencies beyond the GPS limit via long-haul optical frequency dissemination

Abstract

Global Positioning System (GPS) dissemination of frequency standards is ubiquitous at present, providing the most widespread time and frequency reference for the majority of industrial and research applications worldwide. On the other hand, the ultimate limits of the GPS presently curb further advances in high-precision, scientific and industrial applications relying on this dissemination scheme. Here, we demonstrate that these limits can be reliably overcome even in laboratories without a local atomic clock by replacing the GPS with a 642-km-long optical fiber link to a remote primary caesium frequency standard. Through this configuration we stably address the ${}^1$S${}_0$---${}^3$P${}_0$ clock transition in an ultracold gas of ${}^{173}$Yb, with a precision that exceeds the possibilities of a GPS-based measurement, dismissing the need for a local clock infrastructure to perform high-precision tasks beyond GPS limit. We also report an improvement of two orders of magnitude in the accuracy on the transition frequency reported in literature.

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Cited by in corpus (11)

• Synthetic dimensions and spin-orbit coupling with an optical clock transition
• QCL-based frequency metrology from the mid-infrared to the THz range: a review
• First industrial-grade coherent fiber link for optical frequency standard dissemination
• Observation of non-linearity of generalized King plot in the search for new boson
• Hybrid fiber links for accurate optical frequency comparisons
• Optical frequency combs in quadratically nonlinear resonators
• SI-traceable frequency dissemination at 1572.06 nm in a stabilized fiber network with ring topology
• Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year
• Interaction Control of Ultracold Alkaline-Earth Atoms
• Ultra-stable optical frequency dissemination on a multi-access fibre network
• Isotope shifts for ${}^1{S}_0-{}^3{P}_{0,1}^o$ Yb lines from multi-configuration Dirac-Hartree-Fock calculations