365 citations · 609 across the 13 of their papers we have counts for
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Analysis of atomic-clock data to constrain variations of fundamental constants
Nathaniel Sherrill, Adam O. Parsons, Charles F. A. Baynham +13
We present a new framework to study the time variation of fundamental constants in a model-independent way. Model independence implies more free parameters than assumed in previous…
Improving the Q factor of an optical atomic clock using quantum non-demolition measurement
William Bowden, Alvise Vianello, Ian R Hill +2
Quantum non-demolition (QND) measurement is a remarkable tool for the manipulation of quantum systems. It allows specific information to be extracted while still preserving fragile…
A strontium optical lattice clock with uncertainty and measurement of its absolute frequency
Richard Hobson, William Bowden, Alissa Silva +5
We present a measurement of the absolute frequency of the 5s S to 5s5p P transition in Sr, which is a secondary representation of the SI second. We descr…
A mid-infrared magneto-optical trap of metastable strontium for an optical lattice clock
Richard Hobson, William Bowden, Alvise Vianello +2
We report on the realization of a magneto-optical trap (MOT) for metastable strontium operating on the 2.92 m transition between the energy levels and $5s4…
Cavity-enhanced non-destructive detection of atoms for an optical lattice clock
Richard Hobson, William Bowden, Alvise Vianello +2
We demonstrate a new method of cavity-enhanced non-destructive detection of atoms for a strontium optical lattice clock. The detection scheme is shown to be linear in atom number u…
A pyramid MOT with integrated optical cavities as a cold atom platform for an optical lattice clock
William Bowden, Richard Hobson, Ian R. Hill +6
We realize a two-stage, hexagonal pyramid magneto-optical trap (MOT) with strontium, and demonstrate loading of cold atoms into cavity-enhanced 1D and 2D optical lattice traps, all…
Guidelines for developing optical clocks with fractional frequency uncertainty
Moustafa Abdel-Hafiz, Piotr Ablewski, Ali Al-Masoudi +42
There has been tremendous progress in the performance of optical frequency standards since the first proposals to carry out precision spectroscopy on trapped, single ions in the 19…
Rydberg Electrometry for Optical Lattice Clocks
William Bowden, Richard Hobson, Paul Huillery +3
Electrometry is performed using Rydberg states to evaluate the quadratic Stark shift of the clock transition in strontium. By measurin…
A low maintenance Sr optical lattice clock
Ian R. Hill, Richard Hobson, William Bowden +4
We describe the Sr optical lattice clock apparatus at NPL with particular emphasis on techniques used to increase reliability and minimise the human requirement in its operation. C…
Modified hyper-Ramsey methods for the elimination of probe shifts in optical clocks
R. Hobson, W. Bowden, S. A. King +3
We develop a method of modified hyper-Ramsey spectroscopy in optical clocks, achieving complete immunity to the frequency shifts induced by the probing fields themselves. Using par…