{"_buckets": {"deposit": "05bb26fa-18fa-4dfc-a1bf-1e0be307e64b"}, "_deposit": {"id": "745", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "745"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00000745"}, "item_2_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2016-02-29", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "261", "bibliographicPageStart": "258", "bibliographicVolumeNumber": "10", "bibliographic_titles": [{"bibliographic_title": "Nature photonics"}]}]}, "item_2_description_5": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Transition frequencies of atoms and ions are among the most accurately accessible quantities in nature, playing important roles in pushing the frontiers of science by testing fundamental laws of physics, in addition to a wide range of applications such as satellite navigation systems. Atomic clocks based on optical transitions approach uncertainties of 10\u221218 (refs\u20091\u20133), where full frequency descriptions are far beyond the reach of the SI second. Direct measurements of the frequency ratios of such super clocks, on the other hand, are not subject to this limitation4, 5, 6, 7, 8. They can verify consistency and overall accuracy for an ensemble of super clocks, an essential step towards a redefinition of the second9. Here we report a measurement that finds the frequency ratio of neutral ytterbium and strontium clocks to be \u211b\u2009=\u20091.207507039343337749(55), with a fractional uncertainty of 4.6\u2009\u00d7\u200910\u221217 and a measurement instability as low as 4\u2009\u00d7\u200910\u221216 (\u03c4/s)\u22121/2.", "subitem_description_type": "Abstract"}]}, "item_2_description_6": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "UTokyo Research\u63b2\u8f09\u300c\u7570\u306a\u308b\u539f\u5b50\u306e\u5149\u683c\u5b50\u6642\u8a08\u306e\u77ed\u6642\u9593\u7cbe\u5bc6\u6bd4\u8f03\u306b\u6210\u529f\u300d URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/rapid-comparison-of-optical-lattice-clocks.html", "subitem_description_type": "Other"}, {"subitem_description": "UTokyo Research \"Rapid comparison of optical lattice clocks\" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/rapid-comparison-of-optical-lattice-clocks.html", "subitem_description_type": "Other"}]}, "item_2_publisher_20": {"attribute_name": "\u51fa\u7248\u8005", "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.2016.20", "subitem_relation_type_select": "DOI"}}]}, "item_2_relation_25": {"attribute_name": "\u95a2\u4fc2URI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/rapid-comparison-of-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/rapid-comparison-of-optical-lattice-clocks.html", "subitem_relation_type_select": "URI"}}, {"subitem_relation_type_id": {"subitem_relation_type_id_text": 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"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": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Nemitz, Nils"}], "nameIdentifiers": [{"nameIdentifier": "2848", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohkubo, Takuya"}], "nameIdentifiers": [{"nameIdentifier": "2849", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Takamoto, Masao"}], "nameIdentifiers": [{"nameIdentifier": "2850", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ushijima, Ichiro"}], "nameIdentifiers": [{"nameIdentifier": "2851", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Das, Manoj"}], "nameIdentifiers": [{"nameIdentifier": "2852", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ohmae, Noriaki"}], "nameIdentifiers": [{"nameIdentifier": "2853", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Katori, Hidetoshi"}], "nameIdentifiers": [{"nameIdentifier": "2854", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2017-05-30"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "20160406_YbSr_final_author_version.pdf", "filesize": [{"value": "1.6 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 1600000.0, "url": {"label": "20160406_YbSr_final_author_version.pdf", "url": "https://repository.dl.itc.u-tokyo.ac.jp/record/745/files/20160406_YbSr_final_author_version.pdf"}, "version_id": "f1e0293e-d801-4ed5-b847-79c1cc3d166b"}]}, "item_keyword": {"attribute_name": "\u30ad\u30fc\u30ef\u30fc\u30c9", "attribute_value_mlt": [{"subitem_subject": "Atomic and molecular physics", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Quantum metrology", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Optical spectroscopy", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Frequency ratio of Yb and Sr clocks with 5\u2009\u00d7\u200910\u221217 uncertainty at 150\u2005seconds averaging time", "item_titles": 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