List of atomic clocks This is a list of some experimental laboratory atomic clocks worldwide. This list is incomplete; you can help by adding missing items. (March 2013) Name Operation date Type Accuracy Location Image CS1[1] 1969 Cs 7×10−15 Physikalisch-Technische Bundesanstalt Braunschweig,  Germany CS2[2] 1985 Cs 1.2×10−14 Physikalisch-Technische Bundesanstalt Braunschweig,  Germany CS3 1988 Cs Physikalisch-Technische Bundesanstalt Braunschweig,  Germany CS4 1992-2005 Cs Physikalisch-Technische Bundesanstalt Braunschweig,  Germany CSF1[3] 1999 Cs fountain 4×10−16 Physikalisch-Technische Bundesanstalt Braunschweig,  Germany CSF2[4] 2009 Cs fountain 2×10−16 Physikalisch-Technische Bundesanstalt Braunschweig,  Germany FOCS Federal Institute of Metrology Wabern,  Switzerland NPL-CsF2, Yb+ and Sr+ ion clocks, Sr lattice clock, 4 hydrogen masers[5][6] National Physical Laboratory Teddington, London,  United Kingdom NIST-F1,[7] Cs fountain 3.1×10−16 NIST Boulder Laboratories Boulder, Colorado  United States[8] NIST-F2[9] Cs fountain 1.1×10−16 NIST Boulder Laboratories Boulder, Colorado  United States[10] USNO Alternate Master Clock Schriever Air Force Base El Paso County, Colorado  United States[11] WWV WWVB Larimer County, Colorado  United States[12] Department of Defense master clock United States Naval Observatory Washington, D.C.  United States 18 cesium atomic clocks and 4 hydrogen maser clocks Cs, H National Institute of Information and Communications Technology Koganei,  Japan[13] Optical lattice clock University of Tokyo Bunkyō, Tokyo,  Japan[14][15] NMIJ-F1, NMIJ-F2[16] Cs fountain 4.7×10−16 National Metrology Institute of Japan Tokyo,  Japan Optical clock[17] 2012 Ca ion Hubei,  China Caesium Beam Atomic Clock[18][19] Cs Hong Kong Observatory Tsim Sha Tsui, Hong Kong  China[20] 9 Agilent 5071A caesium clocks[21] Cs 5×10−13 National Standard Time and Frequency Laboratory Taoyuan,  Taiwan[22] KRISS-1[23][24] Cs 1×10−14 Korea Research Institute of Standards and Science Daejeon,  South Korea Caesium atomic clocks[25] Cs National Metrology Centre Queenstown,  Singapore Five caesium clocks, one passive hydrogen maser, two active hydrogen masers.[26] Cs, H National Physical Laboratory of India New Delhi,  India DOST-PAGASA Juan Time[27] Department of Science and Technology Taguig,  Philippines Caesium clocks, Hydrogen Maser [28] Cs Indonesian Institute of Sciences Jakarta,  Indonesia SOC: Space Optical Clock breadboard (Sr lattice clock)[29] Sr lattice European Space Agency Düsseldorf,  Germany Braunschweig,  Germany Birmingham,  United Kingdom Paris,  France Florence,  Italy Turin,  Italy Prague,  Czech Republic Deep Space Atomic Clock[30] 2019-2021 Hg ion Jet Propulsion Laboratory La Cañada Flintridge, California  United States Caesium atomic clocks[31] Cs Laboratorium Czasu i Częstotliwości (CBK PAN) Borówiec,  Poland References ^ "Seit wann läuft die erste Atomuhr in der PTB?". Themenrundgänge / Fragen zur Zeit. Physikalisch-Technische Bundesanstalt. Archived from the original on 2012-11-27. Retrieved 2013-02-04. ^ "Seit wann läuft die erste Atomuhr in der PTB?". Themenrundgänge / Fragen zur Zeit. Physikalisch-Technische Bundesanstalt. Archived from the original on 2012-11-27. Retrieved 2013-02-04. ^ "Seit wann läuft die erste Atomuhr in der PTB?". Themenrundgänge / Fragen zur Zeit. Physikalisch-Technische Bundesanstalt. Archived from the original on 2012-11-27. Retrieved 2013-02-04. ^ "Seit wann läuft die erste Atomuhr in der PTB?". Themenrundgänge / Fragen zur Zeit. Physikalisch-Technische Bundesanstalt. Archived from the original on 2012-11-27. Retrieved 2013-02-04. ^ Palmer, Jason. "UK's atomic clock 'is world's most accurate'". BBC. Retrieved 2013-03-02. ^ "Research - Time and Frequency". Retrieved 2015-06-12. ^ "A Brief History of Atomic Clocks at NIST". The National Institute of Standards and Technology (NIST). Retrieved 2013-02-04. ^ Newman, Michael E. (1999-12-29). "NIST-F1 Cesium Fountain Clock". NIST News. The National Institute of Standards and Technology (NIST). Retrieved 2013-02-04. ^ "NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock". The National Institute of Standards and Technology (NIST). Retrieved 2016-02-09. ^ Newman, Michael E. (1999-12-29). "NIST-F1 Cesium Fountain Clock". NIST News. The National Institute of Standards and Technology (NIST). Retrieved 2013-02-04. ^ "U.S. Naval Observatory Alternate Master Clock". U.S. Navy. Archived from the original on November 26, 1996. Retrieved 2013-02-09. ^ "Larimer County station helps set clocks". Fort Collins Coloradoan. Gannett Company. July 24, 2015. Retrieved August 27, 2018. ^ "Mission of Japan Standard Time Group - Generation of Japan Standard Time (JST)". National Institute of Information and Communications Technology. Retrieved 2013-03-05. ^ Motal, Julius (2011-08-30). "Japanese atomic clock is accurate to a 100 quadrillionth of a second". Geek.com. Ziff Davis, Inc. Archived from the original on 2012-06-14. Retrieved 2013-03-02. ^ "Quantum Metrology Laboratory". RIKEN Advanced Science Institute. Archived from the original on 2013-03-03. Retrieved 2013-03-05. ^ Takamizawa, A.; Yanagimachi, S.; Shirakawa, Y.; Watabe, K.; Hagimoto, K.; Ikegami, T., "Cesium Atomic Fountain Clocks at NMIJ" (PDF), Precise Time and Time Interval Systems and Applications Meeting, pp. 321–328, archived from the original (PDF) on 2011-04-28 ^ Wang, Yuanyuan (2012-07-12). "China unveils first optical clock". English News. Xinhuanet. Archived from the original on 2012-07-15. Retrieved 2013-02-04. ^ "Caesium Beam Atomic Clock". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-14. ^ "History of Hong Kong Time Service". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-11. ^ "Contact us". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-11. ^ "Clocks and Time scales". National Time and Frequency Standard Laboratory. Retrieved 2013-02-14. ^ "Current activities of the National Standard Time and Frequency Laboratory of the Telecommunication Laboratories" (PDF). Archived from the original (PDF) on 2013-02-17. Retrieved 2013-02-14. ^ "Development of Korea's First Primary Frequency Standard, 'KRISS-1'" (PDF). KRISS. Retrieved 2013-03-01. ^ Lee, Ho Seong; Kwon, Taeg Yong; Park, Sang Eon; Choi, Sang-Kyung; Park, Young-Ho (August 2004). "Research on Cesium Atomic Clocks at the Korea Research Institute of Standards and Science". Journal of the Korean Physical Society. 45 (2): 256–272. Archived from the original on 2016-03-04. Retrieved 2013-03-06. ^ "About SST". National Metrology Centre. Archived from the original on 2013-04-18. Retrieved 2013-03-01. ^ "Time and Frequency Metrology". CSIR-National Physical Laboratory. CSIR-National Physical Laboratory. Retrieved 2023-03-25. ^ "With PST, "Filipino time" is now "on time"". Department of Science and Technology. Retrieved 2014-06-07. ^ "Time Standard". Indonesian Institute of Sciences. Archived from the original on 2016-01-21. Retrieved 2016-06-22. ^ "Space Optical Clock". Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf. Retrieved 2017-01-30. ^ "Deep Space Atomic Clock". NASA's Jet Propulsion Laboratory. NASA. 27 April 2015. Retrieved 2015-10-28. ^ "Uruchomiono najdokładniejszy zegar atomowy w Polsce. Nie straci nawet sekundy przez 200 mln lat". wyborcza.pl. Retrieved 2018-03-24.

Index: pl ar de en es fr it arz nl ja pt ceb sv uk vi war zh ru af ast az bg zh-min-nan bn be ca cs cy da et el eo eu fa gl ko hi hr id he ka la lv lt hu mk ms min no nn ce uz kk ro simple sk sl sr sh fi ta tt th tg azb tr ur zh-yue hy my ace als am an hyw ban bjn map-bms ba be-tarask bcl bpy bar bs br cv nv eml hif fo fy ga gd gu hak ha hsb io ig ilo ia ie os is jv kn ht ku ckb ky mrj lb lij li lmo mai mg ml zh-classical mr xmf mzn cdo mn nap new ne frr oc mhr or as pa pnb ps pms nds crh qu sa sah sco sq scn si sd szl su sw tl shn te bug vec vo wa wuu yi yo diq bat-smg zu lad kbd ang smn ab roa-rup frp arc gn av ay bh bi bo bxr cbk-zam co za dag ary se pdc dv dsb myv ext fur gv gag inh ki glk gan guw xal haw rw kbp pam csb kw km kv koi kg gom ks gcr lo lbe ltg lez nia ln jbo lg mt mi tw mwl mdf mnw nqo fj nah na nds-nl nrm nov om pi pag pap pfl pcd krc kaa ksh rm rue sm sat sc trv stq nso sn cu so srn kab roa-tara tet tpi to chr tum tk tyv udm ug vep fiu-vro vls wo xh zea ty ak bm ch ny ee ff got iu ik kl mad cr pih ami pwn pnt dz rmy rn sg st tn ss ti din chy ts kcg ve

Prefix: a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9

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