Combined atomic clock with blackbody-radiation-shift-induced instability below 10-19under natural environment conditions

authored by
V. I. Yudin, A. V. Taichenachev, M. Yu Basalaev, O. N. Prudnikov, H. A. Fürst, T. E. Mehlstaubler, S. N. Bagayev

We develop a method of synthetic frequency generation to construct an atomic clock with blackbody radiation (BBR) shift uncertainties below 10-19 at environmental conditions with a very low level of temperature control. The proposed method can be implemented for atoms and ions, which have two different clock transitions with frequencies ν1 and ν2 allowing to form a synthetic reference frequency νsyn = (ν1 - ϵν2)/(1 - ϵ), which is absent in the spectrum of the involved atoms or ions. Calibration coefficient ϵ can be chosen such that the temperature dependence of the BBR shift for the synthetic frequency νsyn has a local extremum at an arbitrary operating temperature T0. This leads to a weak sensitivity of BBR shift with respect to the temperature variations near operating temperature T0. As a specific example, the Yb+ ion is studied in detail, where the utilized optical clock transitions are of electric quadrupole (S → D) and octupole (S → F) type. In this case, temperature variations of ±7 K lead to BBR shift uncertainties of less than 10-19, showing the possibility to construct ultra-precise combined atomic clocks (including portable ones) without the use of cryogenic techniques.

Institute of Quantum Optics
External Organisation(s)
Novosibirsk State University
RAS - Institute of Laser Physics
Novosibirsk State Technical University
National Metrology Institute of Germany (PTB)
New journal of physics
Publication date
Publication status
Peer reviewed
ASJC Scopus subject areas
Physics and Astronomy(all)
Electronic version(s) (Access: Open)