![]() and A katsuka T., Proceedings of the IEEE International Frequency Control Symposium, IFCS 2012, p. K atori H., T akamoto M., T akano T., U shijima I., O hkubo T., Y amanaka K., O hmae N., A so Y., S hoda A., U shiba T., T houmany P., D as M., C hristensen B. S eel S., S torz R., R uoso G., M lynek J. W., A high stability optical frequency reference based on thermal calcium atoms, in Proceedings of IEEE International Frequency Control Symposium, IFCS 2012, pp. In 1967, the International System of Units (SI) redefined the second as the time it takes a cesium-133 atom to release. W., T akase K., Wu X., D eslauriers L., R oy S. These clocks work to measure time by using the frequency of atom vibrations. Express, 19 (2011) 3471.Ī rgence B., P revost E., L éveque R., L e G off R., B ize S., L emonde P. S antarelli G., A udoin C., M akdissi A., L aurent P., D ick G. ColdQuanta will serve as a subcontractor to Vescent, which secured the 15.6 million total award. SPIE, 6673 (2007) 66730F.ĭ ick G., Local oscillator induced instabilities in trapped ion frequency clock, in Proceedings of Precise Time and Time Intervals (USNO, Redondo Beach) 1987, p. PRESS RELEASE ColdQuanta, the global quantum ecosystem leader, today announced it has been awarded a 5-year subcontract in response to an ONR Broad Area Announcement (BAA) to develop portable atomic clocks. E., F errari G., P revedelli M., S orrentino F., T arallo M. K essler T., H agemann C., G rebing C., L egero T., S terr U., R iehle F., M artin M. thesis, Dipartimento di Fisica e Astronomia, Università di Firenze, Firenze (Dec. S chioppo M., Development of a transportable strontium optical clock, Ph.D. and S twalley W., Cold Molecules (CRC Press Inc.) 2009. Phys., 70 (1998) 721 C ohen-T annoudji C laude N., Rev. M a L.-S., B i Z., B artels A., R obertsson L., Z ucco M., W indeler R. J., B ouyer P., D ittus H., E rtmer W., G oerlitz A., I nguscio M., L andragin A., L emonde P., L ammerzahl C., P eters A., R asel E., R eichel J., S alomon C., S chiller S., S chleich W., S engstock K., S terr U. M., C acciapuoti L., B ongs K., B orde C. and Y e J., preprint, arXiv:1309.1137 (2013) to be published in Nature. ![]() L., B ishof M., Z hang X., Z hang W., B romley S. T ouahri D., A cef O., C lairon A., Z ondy J.-J., Felder R., H ilico L., de B eauvoir B., B iraben F. U dem T., H uber A., G ross B., R eichert J., P revedelli M., W eitz M. S chnatz H., L ipphardt B., H elmcke J., R iehle F. H ollberg L., D iddams S., B artels A., F ortier T. Repeated measurements on these ultracold trapped atoms are stitched together to make the optical clock.H all J. Since these oscillations are at optical frequencies, one second is exceedingly long, as nearly 10 15 cycles evolve, dividing time into ultrafine intervals. The atoms are then prepared into a single quantum state, at which point electron oscillations are driven by a highly frequency-stabilized laser that permits coherent atom–laser interaction times up to or exceeding one second 3, 4. For example, an optical lattice clock uses ultracold atoms that have been laser cooled to just above absolute zero and are confined in a specially designed periodic laser trap - an optical lattice 2. ![]() To make the very best clocks, the atoms at the heart of the clock must be kept in carefully designed conditions to eliminate or control effects which would otherwise compromise the intrinsic atomic timebase of these oscillations. ![]() Any atomic clock measures time by counting oscillations of an electron bound to the atom.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |