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description=The Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.;

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time and frequency division nist skip to main content an official website of the united states government here s how you know here s how you know official websites use gov a gov website belongs to an official government organization in the united states secure gov websites use https a lock lock a locked padlock or https means you ve safely connected to the gov website share sensitive information only on official secure websites https www nist gov pml time and frequency division search nist menu close publications what we do all topics advanced communications bioscience buildings and construction chemistry cybersecurity and privacy electronics energy environment fire forensic science health information technology infrastructure manufacturing materials mathematics and statistics metrology nanotechnology neutron research performance excellence physics public safety quantum information science resilience standards super intelligence transportation labs major programs laboratories communications technology laboratory engineering laboratory information technology laboratory material measurement laboratory physical measurement laboratory user facilities nist center for neutron research cnst nanofab research test beds research projects tools instruments major programs chips for america initiative congressionally identified project program cipp manufacturing extension partnership mep manufacturing usa office of advanced manufacturing technology partnerships office services resources measurements and standards calibration services laboratory accreditation nvlap quality system standard reference materials srms standard reference instruments sris standards gov time services office of weights and measures software data chemistry webbook national vulnerability database physical reference data standard reference data srd storefront license patents computer security resource center csrc nist research library news events news events blogs nist in focus feature stories awards video gallery image gallery media contacts about nist about us leadership organization structure budget planning contact us visit careers student programs work with nist history nist digital archives nist museum nist and the nobel educational resources physical measurement laboratory time and frequency division the time and frequency division maintains the standard for frequency and time interval for the united states provides official time to the united states and carries out a broad program of research and service activities in time and frequency metrology laboratory homepage division homepage official united states time groups expand or collapse atomic devices and instrumentation ion storage neutral atom optical clocks phase noise metrology precision photonic synthesis quantum nonlinear nanophotonics time realization and distribution publications staff directory time distribution expand or collapse automated computer time service acts gps data archive gps time transfer internet time service its radio station wwv radio station wwvb radio station wwvh remote frequency calibrations fmas remote time calibrations tmas telephone time of day ttds two way satellite time and frequency transfer twstft time realization expand or collapse leap seconds cesium fountain atomic clocks time scale data and bulletin archive utc nist time scale groups atomic devices and instrumentation group ion storage group neutral atom optical clocks group phase noise metrology group precision photonic synthesis group quantum nonlinear nanophotonics group time realization and distribution group photonics and chip scale devices time and frequency metrology and distribution quantum information sensing and networking featured content definitions of si base units calibration services in the time and frequency division keeping time at nist blog post help with radio controlled clocks telephone time frequently asked questions faq time frequency division history time and frequency from a to z a walk through time news and updates any color you like nist scientists create any wavelength lasers in tiny circuits for light april 15 2026 nist scientists and collaborators have pioneered a way to make integrated circuits for light by depositing complex patterns of specialized materials onto nist physicists bring unruly molecules to the quantum party december 18 2025 molecules can serve as versatile building blocks for quantum technologies but they are much harder to control than atoms what time is it on mars nist physicists have the answer december 1 2025 this calculation is necessary for future space navigation and communication networks nist ion clock sets new record for most accurate clock in the world july 14 2025 this new result contributes to the international effort to define the second with a much greater level of accuracy than before enabling new scientific and view all news and updates projects and programs chip scale ultraprecise laser technologies ongoing lasers with high spectral purity are used in a diverse application space including coherent high speed communications physical sensing and manipulation of quantum systems lab bench scale fabry perot cavities based on sophisticated vibration thermal and atmospheric isolation have made possible compact cold atom instruments ongoing chip scale laser cooling this project develops technologies to achieve chip scale laser cooling beyond direct miniaturization of existing laboratory techniques this includes development of the vacuum technology for realizing low power passively pumped ultra high vacuum chambers 1 2 and novel compact strontium optical clock with integrated photonics ongoing the development of a liter scale apparatus to produce sr would enable highly accurate transportable optical clocks based on their ultra narrow optical transition however straightforward miniaturization of the traditional optical infrastructure necessary to implement multi step laser cooling has compact ultrastable optical references ongoing at the heart of any stable laser is a reference cavity resonator by locking a laser s frequency to a reference cavity mode the laser inherits the resonator s stability these stable lasers can then be used in various sensing and spectroscopy applications including in optical atomic clocks and view all projects programs awards 2024 arthur s flemming award jeffrey sherman recognized for technical and managerial leadership of the atomic clock ensemble that serves as the nation s source of official time 2024 colleagues choice award susan schima for excellence in the essential microfabrication work that has enabled multiple generations of chip scale clocks and quantum sensors 2024 bronze medal award daniel slichter varun verma dietrich leibfried richard mirin for the realization of the first single photon detector integrated with an ion trap for the high fidelity state readout of a trapped ion quantum bit 2024 samuel wesley stratton award scott papp for pioneering research in the development and applications of microresonator frequency combs and nonlinear nanophotonic systems view all awards press coverage any wavelength lasers for pics laser focus world april 27 2026 nist led team of researchers leverages nonlinear optics of tantalum pentoxide to achieve any wavelength lasers atop other photonic circuitry to allow nist scientists produce selectable wavelength lasers in tiny circuits optics april 22 2026 stacking dopants on fingernail sized silicon wafers is new way to make optical chips nist chip expands laser range photonic integrated circuits april 16 2026 researchers at the national institute of standards and technology nist have developed a new class of photonic integrated circuits capable of generating laser nist research project makes it easier for researchers to fabricate silicon photonics chips scientific computing world april 16 2026 nist s chips could help emerging technologies such as quantum computers and optical atomic clocks escape the lab and start to impact biomedicine navigation time passes quite differently on mars and now we know how for the first time twisted sifter march 7 2026 sixty seconds in a minute sixty minutes in an hour twenty four hours in a day 365 days in a year or 366 days in a leap year like i was sayin time keeps on ticking but on mars it s slightly slower daily republic february 15 2026 the old saying about time that the days are long and the years are short is true on mars with a twist because on mars the days are long and the years are mars time ticks faster than earth einstein was right wion podcast january 24 2026 scientists have confirmed something straight out of science fiction time on mars moves differently than it does on earth patents laser ultrastable photonics with integrated nonlinearity for extended stability nist inventors scott papp optical photonic integrated optical clocks on photonic integrated circuits are described the optical clocks can provide the timing stability of atomic clocks at ultra low size and power the optical clocks are be fabricated using cmos foundry fabrication processes continuous wave laser source and making a continuous wave laser source nist inventors scott papp a method of designing a continuous wave laser source having a target output wavelength and an input laser with a wavelength different from the target output wavelength includes the steps of receiving the target output wavelength and subordinate properties of the laser source determining a mapping probe for real time signal sampling and recovery from engineered electromagnetic interference the invention is a probing instrument that can recover a signal normally a signal would be a 3d environment such as a room a building a city etc by illuminating the signal with electromagnetic radiation structured in space and time according to the excitation signals applied to the delivering signals to cryogenic environments via photonic links nist inventors franklyn quinlan scott diddams joe aumentado florent lecocq and john teufel an operational environment is disclosed herein that includes a cryogenic environment and a signal source the cryogenic environment includes a signal target an optical link signal converter devices and an electrical link outside of the cryogenic environment the signal source generates an view all patents nobel prize 2012 nobel prize in physics to dave wineland of nist time and frequency division dave wineland of the ion storage group shares the 2012 nobel prize in physics with serge haroche of france for ground breaking experimental methods that enable measuring and manipulation of individual quantum systems dave and his colleagues use these techniques for research in quantum information processing quantum simulation atomic clocks and other areas more information about the ion storage group can be found here for more information about the 2012 nobel prize in physics please see the nobel prize organization site selected publications an atomic clock with 10 18 instability quantum spin dynamics and entanglement generation with hundreds of trapped ions wwvb radio controlled clocks recommended practices for manufacturers and consumers 2009 edition complete methods set for scalable ion trap quantum information processing a spin 1 2 optical lattice clock nist on a chip realizing si units with microfabricated alkali vapour cells contacts acting division chief john kitching email protected 303 497 4083 division secretary brandy wallace email protected 303 497 7290 was this page helpful headquarters 100 bureau drive gaithersburg md 20899 301 975 2000 webmaster contact us our other offices x com facebook linkedin instagram youtube giphy rss feed mailing list how are we doing feedback site privacy accessibility privacy program copyright disclaimers vulnerability disclosure no fear act policy foia environmental policy scientific integrity information quality standards commerce gov science gov usa gov vote gov