Demonstration of a free space rubidium atomic clock with noise below the quantum projection limit
Quantum Physics
2020-07-29 v1
Abstract
A technique is demonstrated that allows free space atomic fountain clocks and interferometers to utilize optical cavity generated spin-squeezed states with over atoms. Fluorescence imaging is used for population spectroscopy, after a free fall time of 4 milliseconds, to resolve a single-shot phase sensitivity of microradians, which is decibels (dB) below the quantum projection limit. The dynamic range is observed to be 100 milliradians. When operating as a microwave atomic clock with atoms at a 3.6 ms Ramsey time, a single-shot fractional frequency stability of is reported, dB below the quantum projection limit.
Cite
@article{arxiv.1912.10218,
title = {Demonstration of a free space rubidium atomic clock with noise below the quantum projection limit},
author = {Benjamin K. Malia and Julián Martínez-Rincón and Yunfan Wu and Onur Hosten and Mark A. Kasevich},
journal= {arXiv preprint arXiv:1912.10218},
year = {2020}
}