Sr atom interferometry with the optical clock transition as a gravimeter and a gravity gradiometer

Hu, Liang, Wang, Enlong, Salvi, Leonardo, Tinsley, Jonathan N ORCID: 0000-0002-4925-9350, Tino, Guglielmo M and Poli, Nicola (2020) Sr atom interferometry with the optical clock transition as a gravimeter and a gravity gradiometer. CLASSICAL AND QUANTUM GRAVITY, 37 (1). 014001-014001.

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Official URL: http://dx.doi.org/10.1088/1361-6382/ab4d18

Abstract

<jats:title>Abstract</jats:title> <jats:p>We characterize the performance of a gravimeter and a gravity gradiometer based on the <jats:sup>1</jats:sup>S<jats:sub>0</jats:sub>–<jats:sup>3</jats:sup>P<jats:sub>0</jats:sub> clock transition of strontium atoms. We use this new quantum sensor to measure the gravitational acceleration with a relative sensitivity of <jats:inline-formula> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cqgab4d18ieqn001.gif" xlink:type="simple" /> </jats:inline-formula> after 150 s of integration time, representing the first realisation of an atomic interferometry gravimeter based on a single-photon transition. Various noise contributions to the gravimeter are measured and characterized, with the current primary limitation to sensitivity seen to be the intrinsic noise of the interferometry laser itself. In a gravity gradiometer configuration, a differential phase sensitivity of 1.53 rad <jats:inline-formula> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cqgab4d18ieqn002.gif" xlink:type="simple" /> </jats:inline-formula> was achieved at an artificially introduced differential phase of <jats:inline-formula> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cqgab4d18ieqn003.gif" xlink:type="simple" /> </jats:inline-formula> rad. We experimentally investigated the effects of the contrast and visibility based on various parameters and achieved a total interferometry time of 30 ms, which is longer than previously reported for such interferometers. The characterization and determined limitations of the present apparatus employing <jats:sup>88</jats:sup>Sr atoms provides a guidance for the future development of large-scale clock-transition gravimeters and gravity gradiometers with alkali-earth and alkali-earth-like atoms (e.g. <jats:sup>87</jats:sup>Sr, Ca, Yb, Cd).</jats:p>

Item Type:	Article
Uncontrolled Keywords:	strontium, atom interferometry, optical clock, gravimeter, gravity gradiometer
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	23 Feb 2024 16:45
Last Modified:	23 Feb 2024 16:46
DOI:	10.1088/1361-6382/ab4d18
Open Access URL:	https://iopscience.iop.org/article/10.1088/1361-63...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3178853