{"created":"2021-03-01T06:17:14.635615+00:00","id":699,"links":{},"metadata":{"_buckets":{"deposit":"a66d8a83-23bc-423d-a228-6f5d24f3530d"},"_deposit":{"id":"699","owners":[],"pid":{"revision_id":0,"type":"depid","value":"699"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00000699","sets":["6:153:154","9:10:11"]},"item_2_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2015-02-09","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"189","bibliographicPageStart":"185","bibliographicVolumeNumber":"9","bibliographic_titles":[{"bibliographic_title":"Nature photonics"}]}]},"item_2_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The accuracy of atomic clocks relies on the superb reproducibility of atomic spectroscopy, which is accomplished by careful control and the elimination of environmental perturbations on atoms. To date, individual atomic clocks have achieved a 10−18 level of total uncertainties, but a two-clock comparison at the 10−18 level has yet to be demonstrated. Here, we demonstrate optical lattice clocks with 87Sr atoms interrogated in a cryogenic environment to address the blackbody radiation-induced frequency shift3, which remains the primary source of systematic uncertainty  and has initiated vigorous theoretical and experimental investigations. The systematic uncertainty for the cryogenic clock is evaluated to be 7.2 × 10−18, which is expedited by operating two such cryo-clocks synchronously. After 11 measurements performed over a month, statistical agreement between the two cryo-clocks reached 2.0 × 10−18. Such clocks'reproducibility is a major step towards developing accurate clocks at the low 10−18 level, and is directly applicable as a means for relativistic geodesy.","subitem_description_type":"Abstract"}]},"item_2_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"UTokyo Research掲載「次世代時間標準「光格子時計」の高精度化に成功」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/precise-futuristic-timekeeping-with-optical-lattice-clocks.html","subitem_description_type":"Other"},{"subitem_description":"UTokyo Research \"Precise futuristic timekeeping with optical lattice clocks\" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/precise-futuristic-timekeeping-with-optical-lattice-clocks.html","subitem_description_type":"Other"}]},"item_2_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Nature Publishing Group"}]},"item_2_relation_11":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"info:doi/10.1038/nphoton.2015.5","subitem_relation_type_select":"DOI"}}]},"item_2_relation_25":{"attribute_name":"関係URI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/precise-futuristic-timekeeping-with-optical-lattice-clocks.html","subitem_relation_type_select":"URI"}},{"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/precise-futuristic-timekeeping-with-optical-lattice-clocks.html","subitem_relation_type_select":"URI"}},{"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://www.nature.com/nphoton/journal/vaop/ncurrent/abs/nphoton.2015.5.html","subitem_relation_type_select":"URI"}}]},"item_2_rights_12":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"Copyright © 2015, Rights Managed by Nature Publishing Group"}]},"item_2_select_14":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"author"}]},"item_2_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA12300925","subitem_source_identifier_type":"NCID"}]},"item_2_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1749-4885","subitem_source_identifier_type":"ISSN"},{"subitem_source_identifier":"1749-4893","subitem_source_identifier_type":"ISSN"}]},"item_2_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"Quantum Metrology Laboratory, RIKEN"},{"subitem_text_value":"Innovative Space-Time Project, ERATO, Japan Science and Technology Agency"},{"subitem_text_value":"Department of Applied Physics, Graduate School of Engineering, The University of Tokyo"},{"subitem_text_value":"RIKEN Center for Advanced Photonics"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Ichiro, Ushijima"}],"nameIdentifiers":[{"nameIdentifier":"2581","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Masao, Takamoto"}],"nameIdentifiers":[{"nameIdentifier":"2582","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Manoj, Das"}],"nameIdentifiers":[{"nameIdentifier":"2583","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Takuya, Ohkubo"}],"nameIdentifiers":[{"nameIdentifier":"2584","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hidetoshi, Katori"}],"nameIdentifiers":[{"nameIdentifier":"2585","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-05-30"}],"displaytype":"detail","filename":"nphoton.2015.5_author_version.pdf","filesize":[{"value":"192.3 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"nphoton.2015.5_author_version.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/699/files/nphoton.2015.5_author_version.pdf"},"version_id":"57fc9e11-239f-49ee-9b11-aa196a28dd40"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Cryogenic optical lattice clocks","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Cryogenic optical lattice clocks"}]},"item_type_id":"2","owner":"1","path":["11","154"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-08-10"},"publish_date":"2015-08-10","publish_status":"0","recid":"699","relation_version_is_last":true,"title":["Cryogenic optical lattice clocks"],"weko_creator_id":"1","weko_shared_id":2},"updated":"2022-12-19T03:41:42.281329+00:00"}