10.15488/1728
Leroux, Ian D.
Ian D.
Leroux
Scharnhorst, Nils
Nils
Scharnhorst
Hannig, Stephan
Stephan
Hannig
Kramer, Johannes
Johannes
Kramer
Pelzer, Lennart
Lennart
Pelzer
Stepanova, Mariia
Mariia
Stepanova
Schmidt, Piet O.
Piet O.
Schmidt
On-line estimation of local oscillator noise and optimisation of servo parameters in atomic clocks
Bristol : Institute of Physics Publishing
2017
Article
Atomic frequency standards
Local oscillator noise
Quantum projection noise
Servo optimisation
Atomic clocks
Frequency standards
Optimization
Frequency fluctuation
Local oscillator frequencies
Local oscillators
Optimal linear prediction
Optimisations
Spectral properties
Parameter estimation
Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
Technische Informationsbibliothek (TIB)
Technische Informationsbibliothek (TIB)
2017-07-17
2017-07-17
2017
en
Leroux, I.D.; Scharnhorst, N.; Hannig, S.; Kramer, J.; Pelzer, L. et al.: On-line estimation of local oscillator noise and optimisation of servo parameters in atomic clocks. In: Metrologia 54 (2017), Nr. 3, S. 307-321. DOI: https://doi.org/10.1088/1681-7575/aa66e9
http://www.repo.uni-hannover.de/handle/123456789/1753
CC BY 3.0 Unported
Creative Commons Attribution 3.0 Unported
For atomic frequency standards in which fluctuations of the local oscillator (LO) frequency are the dominant noise source, we examine the role of the the servo algorithm that predicts and corrects these frequency fluctuations. We derive the optimal linear prediction algorithm, showing how to measure the relevant spectral properties of the noise and optimise servo parameters while the standard is running, using only the atomic error signal. We find that, for realistic LO noise spectra, a conventional integrating servo with a properly chosen gain performs nearly as well as the optimal linear predictor. Using simple analytical models and numerical simulations, we establish optimum probe times as a function of clock atom number and of the dominant noise type in the local oscillator. We calculate the resulting LO-dependent scaling of achievable clock stability with atom number for product states as well as for maximally-correlated states.