{"id":2614,"date":"2022-09-02T14:31:24","date_gmt":"2022-09-02T14:31:24","guid":{"rendered":"https:\/\/www.matterwaveoptics.eu\/?p=2614"},"modified":"2022-09-02T14:34:49","modified_gmt":"2022-09-02T14:34:49","slug":"invited-talk-determination-of-the-fine-structure-constant-using-atom-interferometry","status":"publish","type":"post","link":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/person\/saida-guellati-khelifa\/invited-talk-determination-of-the-fine-structure-constant-using-atom-interferometry\/","title":{"rendered":"Invited Talk: Determination of the fine-structure constant using atom interferometry"},"content":{"rendered":"\n<p class=\"has-text-align-center wp-block-paragraph\"><strong>L\u00e9o Morel<sup>1<\/sup>, Zhibin Yao<sup>1<\/sup>, P. Clad\u00e9<sup>1<\/sup> and S. Guellati-Khelifa<sup>1,2<\/sup><\/strong><br><sup>1<\/sup>Laboratoire Kastler Brossel, Sorbonne University, CNRS, ENS-PSL University, College de France, 4 place Jussieu, 75005 Paris, France<br><sup>2<\/sup>Conservatoire National des Arts est M\u00e9tiers, 292 rue Saint Martin, 75003 Paris, France<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To test the standard model, we need to know the parameters that scale the fundamental interactions. Among them, the fine structure constant  which characterizes the strength of the electromagnetic interaction and thus plays a crucial role in quantum electrodynamics calculations. Using atom interferometry to measure the quotient \u0127\/m<sub>Rb<\/sub> of the reduced Planck\u2019s constant and the mass of a rubidium-87 atom, we obtained the most accurate determination of the fine structure constant \u03b1=1\/137.035999206(11) with a relative accuracy of 81 parts per trillion (ppt) [1]. This value differs by 5.6 \u03c3 from the one deduced from the cesium recoil measurement [3].<br>Combining Ramsey-Bord\u00e9 interferometer based on Raman diffraction with Bloch oscillations in accelerated optical lattice and using an ultra-stable and robust experimental set-up, we achieved a record sensitivity of 4 x 10<sup>-11<\/sup>  to \u03b1  in 48 h integration time. This enabled us to investigate experimentally several systematic effects, especially those related to wave-front distortions [2].<br>In this talk, I will present our experiment and I will discuss the impact of the new value of \u03b1 on the test of the Standard Model based on the comparison between the theoretical and experimental values of the electron anomalous magnetic moment[5, 4]. I will also present some results from our recent work on the atom interferometer based on the diffraction of atoms by a picosecond frequency-comb laser [6].<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">[1] L. Morel, Z. Yao, P. Clad\u00e9 and S. Guellati-Khelifa, <em>Nature<\/em>, 588 (2020), 61\u201365.<br>[2] S. Bade et al., <em>Phys. Rev. Lett.<\/em> 121 (2018), 073603.<br>[3] R. H. Parker, C. Yu, W. Zhong, B. Estey and H. M\u00fcller, <em>Science<\/em>, 360 (2018), 191\u2013195.<br>[4] D. Hanneke, S. Fogwell, and G. Gabrielse, <em>Phys. Rev. Lett. <\/em>100 (2008), 120801.<br>[5] T. Aoyama, T. Kinoshita and M. Nio, <em>Phys. Rev. D<\/em> 97 (2018), 036001.<br>[6] C. Solaro, C. Debavelaere, P. Clad\u00e9, S. Guellati-Khelifa, <em>arXiv:2207.12723.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u00e9o Morel1, Zhibin Yao1, P. Clad\u00e91 and S. Guellati-Khelifa1,21Laboratoire Kastler Brossel, Sorbonne University, CNRS, ENS-PSL University, College de France, 4 place Jussieu, 75005 Paris, France2Conservatoire National des Arts est M\u00e9tiers, 292 rue Saint Martin, 75003 Paris, France To test the standard model, we need to know the parameters that scale the fundamental interactions. Among them, the fine structure constant which characterizes the strength of the electromagnetic interaction and thus plays a crucial role in quantum electrodynamics calculations. Using atom interferometry to measure the quotient \u0127\/mRb of the reduced Planck\u2019s constant and the mass of a rubidium-87 atom, we obtained the most accurate determination of the fine structure constant \u03b1=1\/137.035999206(11) with a relative accuracy of 81 parts per trillion (ppt) [1]. This value differs by 5.6 \u03c3 from the one deduced from the cesium recoil measurement [3].Combining Ramsey-Bord\u00e9 interferometer based on Raman diffraction with Bloch oscillations in accelerated optical lattice and using an ultra-stable and robust experimental set-up, we achieved a record sensitivity of 4 x 10-11 to \u03b1 in 48 h integration time. This enabled us to investigate experimentally several systematic effects, especially those related to wave-front distortions [2].In this talk, I will present our experiment and I will discuss the impact of the new value of \u03b1 on the test of the Standard Model based on the comparison between the theoretical and experimental values of the electron anomalous magnetic moment[5, 4]. I will also present some results from our recent work on the atom interferometer based on the diffraction of atoms by a picosecond frequency-comb laser [6]. [1] L. Morel, Z. Yao, P. Clad\u00e9 and S. Guellati-Khelifa, Nature, 588 (2020), 61\u201365.[2] S. Bade et al., Phys. Rev. Lett. 121 (2018), 073603.[3] R. H. Parker, C. Yu, W. Zhong, B. Estey and H. M\u00fcller, Science, 360 (2018), 191\u2013195.[4] D. Hanneke, S. Fogwell, and G. Gabrielse, Phys. Rev. Lett. 100 (2008), 120801.[5] T. Aoyama, T. Kinoshita and M. Nio, Phys. Rev. D 97 (2018), 036001.[6] C. Solaro, C. Debavelaere, P. Clad\u00e9, S. Guellati-Khelifa, arXiv:2207.12723.<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[84,75],"tags":[],"class_list":["post-2614","post","type-post","status-publish","format-standard","hentry","category-fomo2022-invited-talk","category-saida-guellati-khelifa"],"jetpack_featured_media_url":"","uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"ashe-slider-full-thumbnail":false,"ashe-full-thumbnail":false,"ashe-list-thumbnail":false,"ashe-grid-thumbnail":false,"ashe-single-navigation":false},"uagb_author_info":{"display_name":"Atena Zalbeik-Dormayer","author_link":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/author\/zalbeik-dormayer\/"},"uagb_comment_info":0,"uagb_excerpt":"L\u00e9o Morel1, Zhibin Yao1, P. Clad\u00e91 and S. Guellati-Khelifa1,21Laboratoire Kastler Brossel, Sorbonne University, CNRS, ENS-PSL University, College de France, 4 place Jussieu, 75005 Paris, France2Conservatoire National des Arts est M\u00e9tiers, 292 rue Saint Martin, 75003 Paris, France To test the standard model, we need to know the parameters that scale the fundamental interactions. Among them,&hellip;","jetpack_sharing_enabled":true,"publishpress_future_action":{"enabled":false,"date":"2026-08-01 16:40:24","action":"category","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts\/2614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/comments?post=2614"}],"version-history":[{"count":2,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts\/2614\/revisions"}],"predecessor-version":[{"id":2617,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/posts\/2614\/revisions\/2617"}],"wp:attachment":[{"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/media?parent=2614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/categories?post=2614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.matterwaveoptics.eu\/FOMO2022\/wp-json\/wp\/v2\/tags?post=2614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}