Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 |
| Publisher | World Scientific Publishing Co. Pte Ltd |
| Pages | 307-312 |
| Number of pages | 6 |
| ISBN (print) | 981428212X, 9789814282123 |
| Publication status | Published - 2009 |
| Externally published | Yes |
| Event | 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 - Hatoyama, Saitama, Japan Duration: 25 Aug 2008 → 28 Aug 2008 |
Publication series
| Name | Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008 |
|---|
Abstract
Frequency standards (atomic clocks) based on narrow optical transitions in 27Al+ and 199Hg+ have been developed over the past several years at NIST. Both types of standards are based on single ions confined in Paul traps, but differ in the methods used to prepare and detect the internal atomic states. Al+ lacks a strong, laser-accessible transition for laser-cooling and for state preparation and detection. Coupling with a Be+ ion, trapped simultaneously with the Al+ ion, enables state manipulation, detection, and cooling of the Al+ ion. Both standards have achieved absolute reproducibilities of a few parts in 1017. Development of femtosecond laser frequency combs makes it possible to directly compare optical frequencies. The present determination of fAl/fHg is 1.052 871 833 148 990 438 (55), where the uncertainty is expressed in units of the least significant digit. Measurements of fAl/fHg made over about one year show a drift rate consistent with zero. This result can be used to place limits on time variations of fundamental constants such as the fine structure constant α.
Keywords
- Atomic clocks, Fundamental constants, Optical frequency standards
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008. World Scientific Publishing Co. Pte Ltd, 2009. p. 307-312 (Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Ratio of the AL+ and HG+ optical clock frequencies to 17 decimal places
AU - Itano, W. M.
AU - Rosenband, T.
AU - Hume, D. B.
AU - Schmidt, Piet Oliver
AU - Chou, C. W.
AU - Brusch, A.
AU - Lorini, L.
AU - Oskay, W. H.
AU - Drullinger, R. E.
AU - Bickman, S.
AU - Fortier, T. M.
AU - Stalnaker, J. E.
AU - Diddams, S. A.
AU - Swann, W. C.
AU - Newbury, N. R.
AU - Wineland, D. J.
AU - Bergquist, J. C.
PY - 2009
Y1 - 2009
N2 - Frequency standards (atomic clocks) based on narrow optical transitions in 27Al+ and 199Hg+ have been developed over the past several years at NIST. Both types of standards are based on single ions confined in Paul traps, but differ in the methods used to prepare and detect the internal atomic states. Al+ lacks a strong, laser-accessible transition for laser-cooling and for state preparation and detection. Coupling with a Be+ ion, trapped simultaneously with the Al+ ion, enables state manipulation, detection, and cooling of the Al+ ion. Both standards have achieved absolute reproducibilities of a few parts in 1017. Development of femtosecond laser frequency combs makes it possible to directly compare optical frequencies. The present determination of fAl/fHg is 1.052 871 833 148 990 438 (55), where the uncertainty is expressed in units of the least significant digit. Measurements of fAl/fHg made over about one year show a drift rate consistent with zero. This result can be used to place limits on time variations of fundamental constants such as the fine structure constant α.
AB - Frequency standards (atomic clocks) based on narrow optical transitions in 27Al+ and 199Hg+ have been developed over the past several years at NIST. Both types of standards are based on single ions confined in Paul traps, but differ in the methods used to prepare and detect the internal atomic states. Al+ lacks a strong, laser-accessible transition for laser-cooling and for state preparation and detection. Coupling with a Be+ ion, trapped simultaneously with the Al+ ion, enables state manipulation, detection, and cooling of the Al+ ion. Both standards have achieved absolute reproducibilities of a few parts in 1017. Development of femtosecond laser frequency combs makes it possible to directly compare optical frequencies. The present determination of fAl/fHg is 1.052 871 833 148 990 438 (55), where the uncertainty is expressed in units of the least significant digit. Measurements of fAl/fHg made over about one year show a drift rate consistent with zero. This result can be used to place limits on time variations of fundamental constants such as the fine structure constant α.
KW - Atomic clocks
KW - Fundamental constants
KW - Optical frequency standards
UR - http://www.scopus.com/inward/record.url?scp=84903848952&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84903848952
SN - 981428212X
SN - 9789814282123
T3 - Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
SP - 307
EP - 312
BT - Proceedings of the 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
PB - World Scientific Publishing Co. Pte Ltd
T2 - 9th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology, ISQM-Tokyo 2008
Y2 - 25 August 2008 through 28 August 2008
ER -