Scientific Results

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

Year: 2016

Authors: Clivati C., Cappellini G., Livi L. F., Poggiali F., Siciliani De Cumis M., Mancini M., Pagano G., Frittelli M., Mura A., Costanzo G., Levi F., Calonico D., Fallani L., Catani J., Inguscio M.

Autors Affiliation: INRIM Istituto Nazionale di Ricerca Metrologica, Torino, I-10135, Italy; LENS European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino, I-50019, Italy; INO-CNR Istituto Nazionale di Ottica del CNR, Sezione di Sesto Fiorentino, Sesto Fiorentino, I-50019, Italy; Department of Physics and Astronomy, University of Florence, Sesto Fiorentino, I-50019, Italy; Politecnico di Torino – Dipartimento di Elettronica e Telecomunicazioni, I-10129, Italy

Abstract: lobal 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 1S0 – 3P0 clock transition in an ultracold gas of 173Yb, with a precision that exceeds the possibilities of a GPS-based measurement, dismissing the need for a local clock infrastructure to perform beyond-GPS high-precision tasks. We also report an improvement of two orders of magnitude in the accuracy on the transition frequency reported in literature. © 2016 Optical Society of America.

Journal/Review: OPTICS EXPRESS

Volume: 24 (11)      Pages from: 11865  to: 11875

More Information: We thank P. Cancio Pastor, P. De Natale, P. Lombardi and C. Sias for discussions and experimental contributions and A. Godone and M. Pizzocaro for a careful reading of the manuscript. This work has been supported by research grants MIUR PRIN2012 project AQUASIM, EU FP7 project SIQS and MIUR \”Progetti Premiali\” project LIFT.
KeyWords: Frequency standards; Industrial research; Optical fibers, Absolute frequency; Clock transition; Optical frequency; Optical-fiber links; Orders of magnitude; Research applications; Time and frequencies; Transition frequencies, Global positioning system
DOI: 10.1364/OE.24.011865

Citations: 11
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