Table 4 Fractional frequency shifts and uncertainties from different systematic effects in the 171Yb+ electric octupole clock at PTB [90]
From: Measuring the stability of fundamental constants with a network of clocks
171Yb+ effect | Shift /10−18 | Uncertainty /10−18 |
|---|---|---|
Blackbody radiation (environment) | −70.5 | 1.3 |
Blackbody radiation (coefficient) | – | 1.3 |
Second-order Doppler | −2.3 | 1.5 |
Probe light | 0.0 | 0.8 |
Quadratic d.c. Stark | −0.8 | 0.6 |
Quadrupole | −5.7 | 0.5 |
Background gas | 0.0 | 0.5 |
Second-order Zeeman | −10.4 | 0.2 |
Servo | 0.0 | 0.2 |
Total | Â | 2.7 |