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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	1969	Cs	7×10	Physikalisch-Technische Bundesanstalt Braunschweig,  Germany
CS2	1985	Cs	1.2×10	Physikalisch-Technische Bundesanstalt Braunschweig,  Germany
CS3	1988	Cs		Physikalisch-Technische Bundesanstalt Braunschweig,  Germany
CS4	1992-2005	Cs		Physikalisch-Technische Bundesanstalt Braunschweig,  Germany
CSF1	1999	Cs fountain	4×10	Physikalisch-Technische Bundesanstalt Braunschweig,  Germany
CSF2	2009	Cs fountain	2×10	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				National Physical Laboratory Teddington, London,  United Kingdom
NIST-F1,		Cs fountain	3.1×10	NIST Boulder Laboratories Boulder, Colorado  United States
NIST-F2		Cs fountain	1.1×10	NIST Boulder Laboratories Boulder, Colorado  United States
USNO Alternate Master Clock				Schriever Air Force Base El Paso County, Colorado  United States
WWV				WWVB Larimer County, Colorado  United States
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
Optical lattice clock				University of Tokyo Bunkyō, Tokyo,  Japan
NMIJ-F1, NMIJ-F2		Cs fountain	4.7×10	National Metrology Institute of Japan Tokyo,  Japan
Optical clock	2012	Ca ion		Hubei,  China
Caesium Beam Atomic Clock		Cs		Hong Kong Observatory Tsim Sha Tsui, Hong Kong  China
9 Agilent 5071A caesium clocks		Cs	5×10	National Standard Time and Frequency Laboratory Taoyuan,  Taiwan
KRISS-1		Cs	1×10	Korea Research Institute of Standards and Science Daejeon,  South Korea
Caesium atomic clocks		Cs		National Metrology Centre Queenstown,  Singapore
Five caesium clocks, one passive hydrogen maser, two active hydrogen masers.		Cs, H		National Physical Laboratory of India New Delhi,  India
DOST-PAGASA Juan Time				Department of Science and Technology Taguig,  Philippines
Caesium clocks, Hydrogen Maser		Cs		Indonesian Institute of Sciences Jakarta,  Indonesia
SOC: Space Optical Clock breadboard (Sr lattice clock)		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	2019-2021	Hg ion		Jet Propulsion Laboratory La Cañada Flintridge, California  United States
Caesium atomic clocks		Cs		Laboratorium Czasu i Częstotliwości (CBK PAN) Borówiec,  Poland

References

1. "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.
2. "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.
3. "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.
4. "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.
5. Palmer, Jason. "UK's atomic clock 'is world's most accurate'". BBC. Retrieved 2013-03-02.
6. "Research - Time and Frequency". Retrieved 2015-06-12.
7. "A Brief History of Atomic Clocks at NIST". The National Institute of Standards and Technology (NIST). Retrieved 2013-02-04.
8. 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.
9. "NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock". The National Institute of Standards and Technology (NIST). Retrieved 2016-02-09.
10. 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.
11. "U.S. Naval Observatory Alternate Master Clock". U.S. Navy. Retrieved 2013-02-09.
12. "Larimer County station helps set clocks". Fort Collins Coloradoan. Gannett Company. July 24, 2015. Retrieved August 27, 2018.
13. "Mission of Japan Standard Time Group - Generation of Japan Standard Time (JST)". National Institute of Information and Communications Technology. Retrieved 2013-03-05.
14. 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.
15. "Quantum Metrology Laboratory". RIKEN Advanced Science Institute. Archived from the original on 2013-03-03. Retrieved 2013-03-05.
16. 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
17. 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.
18. "Caesium Beam Atomic Clock". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-14.
19. "History of Hong Kong Time Service". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-11.
20. "Contact us". The Government of the Hong Kong Special Administrative Region. Retrieved 2013-02-11.
21. "Clocks and Time scales". National Time and Frequency Standard Laboratory. Retrieved 2013-02-14.
22. "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.
23. "Development of Korea's First Primary Frequency Standard, 'KRISS-1'" (PDF). KRISS. Retrieved 2013-03-01.
24. 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.
25. "About SST". National Metrology Centre. Archived from the original on 2013-04-18. Retrieved 2013-03-01.
26. "Time and Frequency Metrology". CSIR-National Physical Laboratory. CSIR-National Physical Laboratory. Retrieved 2023-03-25.
27. "With PST, "Filipino time" is now "on time"". Department of Science and Technology. Retrieved 2014-06-07.
28. "Time Standard". Indonesian Institute of Sciences. Archived from the original on 2016-01-21. Retrieved 2016-06-22.
29. "Space Optical Clock". Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf. Retrieved 2017-01-30.
30. "Deep Space Atomic Clock". NASA's Jet Propulsion Laboratory. NASA. 27 April 2015. Retrieved 2015-10-28.
31. "Uruchomiono najdokładniejszy zegar atomowy w Polsce. Nie straci nawet sekundy przez 200 mln lat". wyborcza.pl. Retrieved 2018-03-24.

v t e Time measurement and standards
Chronometry Orders of magnitude Metrology
International standards	Coordinated Universal Time offset UT ΔT DUT1 International Earth Rotation and Reference Systems Service ISO 31-1 ISO 8601 International Atomic Time 12-hour clock 24-hour clock Barycentric Coordinate Time Barycentric Dynamical Time Civil time Daylight saving time Geocentric Coordinate Time International Date Line IERS Reference Meridian Leap second Solar time Terrestrial Time Time zone 180th meridian
Obsolete standards	Ephemeris time Greenwich Mean Time Prime meridian
Time in physics	Absolute space and time Spacetime Chronon Continuous signal Coordinate time Cosmological decade Discrete time and continuous time Proper time Theory of relativity Time dilation Gravitational time dilation Time domain Time-translation symmetry T-symmetry
Horology	Clock Astrarium Atomic clock Complication History of timekeeping devices Hourglass Marine chronometer Marine sandglass Radio clock Watch stopwatch Water clock Sundial Dialing scales Equation of time History of sundials Sundial markup schema
Calendar	Gregorian Hebrew Hindu Holocene Islamic (lunar Hijri) Julian Solar Hijri Astronomical Dominical letter Epact Equinox Intercalation Julian day Leap year Lunar Lunisolar Solar Solstice Tropical year Weekday determination Weekday names
Archaeology and geology	Chronological dating Geologic time scale International Commission on Stratigraphy
Astronomical chronology	Galactic year Nuclear timescale Precession Sidereal time
Other units of time	Instant Flick Shake Jiffy Second Minute Moment Hour Day Week Fortnight Month Year Olympiad Lustrum Decade Century Saeculum Millennium
Related topics	Chronology Duration music Mental chronometry Decimal time Metric time System time Time metrology Time value of money Timekeeper

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