List of atomic clocks

This is a list of some experimental laboratory atomic clocks worldwide.

Image	Name	Location
	CS1, CS2, CSF1, CSF2[1]	Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
	FOCS	Federal Institute of Metrology METAS, Bern, Switzerland
	NPL-CsF2, Yb+ and Sr+ ion clocks, Sr lattice clock, 4 hydrogen masers [2][3]	National Physical Laboratory, Teddington, London, United Kingdom
	NIST-F1,[4] NIST-F2[5]	NIST laboratories, Boulder, Colorado[6]
	Department of Defense master clock	United States Naval Observatory, Washington, D.C., United States
	USNO Alternate Master Clock	Schriever Air Force Base, Colorado, United States[7]
	18 cesium atomic clocks and 4 hydrogen maser clocks	National Institute of Information and Communications Technology, Koganei, Tokyo, Japan[8]
	Optical lattice clock	University of Tokyo, Tokyo, Japan[9][10]
	NMIJ-F1, NMIJ-F2[11]	National Metrology Institute of Japan
	Optical clock[12]	Hubei, People's Republic of China
	Caesium Beam Atomic Clock[13][14]	Hong Kong Observatory, Kowloon, Hong Kong[15]
	9 Agilent 5071A caesium clocks[16]	National Standard Time and Frequency Laboratory, Taoyuan, Taiwan[17]
	KRISS-1[18][19]	Korea Research Institute of Standards and Science, Daejeon, Republic of Korea
	Caesium atomic clocks[20]	National Metrology Centre, Singapore
	NPL clock 1, 2, 3, 4 and 5[21]	National Physical Laboratory (NPL), New Delhi, India
	DOST-PAGASA Juan Time[22]	Department of Science and Technology, Taguig City, Metro Manila, Philippines
	Caesium clocks, Hydrogen Maser [23]	Indonesian Institute of Sciences KIM-LIPI, Puspitek, Tanggerang Selatan, Indonesia
Earth Low Earth Orbit Atomic Clock	Deep Space Atomic Clock [24]	In development at Jet Propulsion Laboratory

References

1. "Seit wann läuft die erste Atomuhr in der PTB?". Themenrundgänge / Fragen zur Zeit. Physikalisch-Technische Bundesanstalt. Retrieved 2013-02-04.
2. Palmer, Jason. "UK's atomic clock 'is world's most accurate'". BBC. Retrieved 2013-03-02.
3. "Research - Time and Frequency". Retrieved 2015-06-12.
4. "A Brief History of Atomic Clocks at NIST". The National Institute of Standards and Technology (NIST). Retrieved 2013-02-04.
5. "NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock". The National Institute of Standards and Technology (NIST). Retrieved 2016-02-09.
6. 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.
7. "U.S. Naval Observatory Alternate Master Clock". U.S. Navy. Retrieved 2013-02-09.
8. "Mission of Japan Standard Time Group - Generation of Japan Standard Time (JST)". National Institute of Information and Communications Technology. Retrieved 2013-03-05.
9. Motal, Julius (2011-08-30). "Japanese atomic clock is accurate to a 100 quadrillionth of a second". Geek.com. Ziff Davis, Inc. Retrieved 2013-03-02.
10. "Quantum Metrology Laboratory". RIKEN Advanced Science Institute. Retrieved 2013-03-05.
11. 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
12. Wang, Yuanyuan (2012-07-12). "China unveils first optical clock". English News. Xinhuanet. Retrieved 2013-02-04.
13. "Caesium Beam Atomic Clock". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-14.
14. "History of Hong Kong Time Service". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-11.
15. "Contact us". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-11.
16. "Clocks and Time scales". National Time and Frequency Standard Laboratory. Retrieved 2013-02-14.
17. "Current activities of the National Standard Time and Frequency Laboratory of the Telecommunication Laboratories" (PDF). Retrieved 2013-02-14.
18. "Development of Korea's First Primary Frequency Standard, 'KRISS-1'" (PDF). KRISS. Retrieved 2013-03-01.
19. 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. Retrieved 2013-03-06.
20. "About SST". National Metrology Centre. Retrieved 2013-03-01.
21. Shoba, V (2008-12-28). "Why time will stop". The Indian Express. The Indian Express ltd. Retrieved 2013-02-04.
22. "With PST, "Filipino time" is now "on time"". Department of Science and Technology. Retrieved 2014-06-07.
23. "Time Standard". Indonesian Institute of Sciences. Retrieved 2016-06-22.
24. "Deep Space Atomic Clock". NASA's Jet Propulsion Laboratory. NASA. 27 April 2015. Retrieved 2015-10-28.