Open AccessCombined atomic clock with blackbody-radiation-shift-induced instability below 10−19 under natural environment conditions
Author(s) -
V I Yudin,
А. В. Тайченачев,
M. Yu. Basalaev,
O. N. Prudnikov,
H. Fürst,
T. E. Mehlstäubler,
S. N. Bagayev
Publication year - 2021
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/abe160
Subject(s) - black body radiation , physics , atomic clock , atomic physics , ion , quadrupole , radiation , calibration , instability , computational physics , optics , quantum mechanics
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 ν 1 and ν 2 allowing to form a synthetic reference frequency ν syn = ( ν 1 − ɛν 2 )/(1 − ɛ ), which is absent in the spectrum of the involved atoms or ions. Calibration coefficient ɛ can be chosen such that the temperature dependence of the BBR shift for the synthetic frequency ν syn has a local extremum at an arbitrary operating temperature T 0 . This leads to a weak sensitivity of BBR shift with respect to the temperature variations near operating temperature T 0 . 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.