Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Steven R. Jefferts"'
Autor:
Samuel Berweger, Nikunjkumar Prajapati, Alexandra B. Artusio-Glimpse, Andrew P. Rotunno, Roger Brown, Christopher L. Holloway, Matthew T. Simons, Eric Imhof, Steven R. Jefferts, Baran N. Kayim, Michael A. Viray, Robert Wyllie, Brian C. Sawyer, Thad G. Walker
Publikováno v:
Physical Review Applied. 19
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c5f948902ad702ae88a4ddc0295b65d
https://doi.org/10.1103/physrevapplied.19.044049
https://doi.org/10.1103/physrevapplied.19.044049
Autor:
Eric Imhof, Thad Walker, Brian C. Sawyer, Steven R. Jefferts, Robert Wyllie, Alexandra B. Artusio-Glimpse, Christopher L. Holloway, Matthew T. Simons
We demonstrate the use of multiple atomic-level Rydberg-atom schemes for continuous frequency detection of radio-frequency (RF) fields. Resonant detection of RF fields by electromagnetically induced transparency and Autler-Townes (AT) splitting in Ry
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74efa8565cab5c5850783a66d431e6d6
Autor:
Maria. C. Delgado Aramburo, Joshua J. Savory, L. I. Ascarrunz, Alessandro Banducci, Y. O. Dudin, Steven R. Jefferts, F. G. Ascarrunz
Publikováno v:
2018 IEEE International Frequency Control Symposium (IFCS).
We present a small portable cold8 7Rubidium atomic clock with frequency uncertainty of less than $3\times 10^{-15}$ in one day of averaging time. The clock is under development at SpectraDynamics for the Defense Advanced Research Projects Agency (DAR
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::826b61ce5a2e245ca84135947b8557b3
https://doi.org/10.1109/fcs.2018.8597585
https://doi.org/10.1109/fcs.2018.8597585
Autor:
Maria. C. Delgado Aramburo, F. G. Ascarrunz, Y. O. Dudin, Joshua J. Savory, Steven R. Jefferts
Publikováno v:
Proceedings of the 49th Annual Precise Time and Time Interval Systems and Applications Meeting.
This paper presents measurements of the long-term frequency stability of a cold Rubidium 87 atomic clock that is under development at SpectraDynamics for the Defense Advanced Research Projects Agency (DARPA) Portable Microwave Cold Atomic Clock Small
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::378728a719b52a519d8db9d00843d410
https://doi.org/10.33012/2018.15599
https://doi.org/10.33012/2018.15599
Autor:
Josh Gordon, Christopher L. Holloway, Steven R. Jefferts, Stephanie Miller, Andrew Schwarzkopf, David A. Anderson, Georg Raithel, Nithiwadee Thaicharoen
Publikováno v:
IEEE Transactions on Antennas and Propagation. 62:6169-6182
We discuss a fundamentally new approach for the measurement of electric (E) fields that will lead to the development of a broadband, direct SI-traceable, compact, self-calibrating E-field probe (sensor). This approach is based on the interaction of r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c36cb9d2f88766508a11afc39fc158c8
https://doi.org/10.1109/tap.2014.2360208
https://doi.org/10.1109/tap.2014.2360208
Autor:
Thomas P. Heavner, Elizabeth A. Donley, Steven R. Jefferts, Filippo Levi, Jon H. Shirley, Stephan E. Barlow, Thomas E. Parker, Giovanni Antonio Costanzo, Neil Ashby
Publikováno v:
Metrologia. 51:174-182
We report the first accuracy evaluation of NIST-F2, a second-generation laser-cooled caesium fountain primary standard developed at the National Institute of Standards and Technology (NIST) with a cryogenic (liquid nitrogen) microwave cavity and flig
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5a41b6044d3bac7d6f4764128cb7074
https://doi.org/10.1088/0026-1394/51/3/174
https://doi.org/10.1088/0026-1394/51/3/174
Publikováno v:
Review of Scientific Instruments. 90:049901
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b51f9130f1e733780a11b1fff8a75175
https://doi.org/10.1063/1.5097130
https://doi.org/10.1063/1.5097130
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 58:1241-1246
Many high-performance atomic frequency standards, including cesium fountains and most optical standards, operate with pulsed measurements, that is, an atomic sample is prepared for measurement, the measurement is made, and the process is repeated at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99530ac4492eebce819358f897c5c1d7
https://doi.org/10.1109/tim.2008.2008590
https://doi.org/10.1109/tim.2008.2008590
Autor:
Steven R. Jefferts, Scott A. Diddams, Nathan R. Newbury, Peter L. Bender, Christopher W. Oates, John L. Hall, Stefano Vitale, Neil Ashby, Jun Ye, Rita Dolesi, W. J. Weber
Publikováno v:
Proceedings of the International Astronomical Union. 5:414-419
Improved accuracy in measurement of the gravitational time delay of electromagnetic waves passing by the sun may be achieved with two drag-free spacecraft, one with a stable clock and laser transmitter and one with a high-stability transponder. We co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::522baecb94046ff0ee60a5073b6430c2
https://doi.org/10.1017/s1743921309990718
https://doi.org/10.1017/s1743921309990718
Autor:
A. Brusch, Thomas E. Parker, Scott A. Diddams, Nathan R. Newbury, Wayne M. Itano, E. Eason, Thomas P. Heavner, Till Rosenband, David Hume, J. C. Bergquist, Robert E. Drullinger, Tara M. Fortier, P. Hastings, Neil Ashby, William C. Swann, Jason Stalnaker, David J. Wineland, Steven R. Jefferts, Luca Lorini
Publikováno v:
The European Physical Journal Special Topics. 163:19-35
The record of atomic clock frequency comparisons at NIST over the past half-decade provides one of the tightest constraints of any present-day temporal variations of the fundamental constants. Notably, the 6-year record of increasingly precise measur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8aadc0114313d1b314f8db435484cf34
https://doi.org/10.1140/epjst/e2008-00807-7
https://doi.org/10.1140/epjst/e2008-00807-7