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

Year: 2020

Authors: Hu L., Wang EL., Salvi L., Tinsley JN., Tino GM., Poli N.

Autors Affiliation: Univ Firenze, Dipartimento Fis & Astron, Via Sansone 1, I-50019 Sesto Fiorentino, Italy; Univ Firenze, LENS INFN Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, Italy; Shanghai Jiao Tong Univ, Dept Elect Engn, Shanghai, Peoples R China; CNR IFAC, Sesto Fiorentino, Italy; CNR INO, Florence, Italy.

Abstract: We characterize the performance of a gravimeter and a gravity gradiometer based on the S-1(0)-P-3(0) clock transition of strontium atoms. We use this new quantum sensor to measure the gravitational acceleration with a relative sensitivity of 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 was achieved at an artificially introduced differential phase of rad. We experimentally investigated the effects of the contrast and visibility based on various parameters and achieved a total interferometry time of 30ms, which is longer than previously reported for such interferometers. The characterization and determined limitations of the present apparatus employing Sr-88 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. Sr-87, Ca, Yb, Cd).

Journal/Review: CLASSICAL AND QUANTUM GRAVITY

Volume: 37 (1)      Pages from:   to:

More Information: We acknowledge financial support from INFN and the Italian Ministry of Education, University and Research (MIUR) under the Progetto Premiale ’Interferometro Atomico’ and PRIN 2015. This project has received funding from the Initial Training Network (ITN) supported by the European Commission’s 7th Framework Programme under Grant Agreement No. 607493. LH acknowledges support by Kayser Italia s.r.l.. NP acknowledges financial support from European Research Council, Grant No. 772126 (TICTOCGRAV) and from European Unions Horizon 2020 Programme, under the project TAIOL of QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement No. 731473). EW acknowledges financial support from the program of China Scholarship Council (No.201703170201). We thank Grzegorz D Pekala for his assistance in data collection and analysis.
KeyWords: strontium; atom interferometry; optical clock; gravimeter; gravity gradiometer
DOI: 10.1088/1361-6382/ab4d18

ImpactFactor: 3.528
Citations: 33
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