Systematic evaluation of an atomic clock at 2 x 10 -18 total uncertainty

被引：606

作者：

Nicholson, T. L. ^{[1
,2
,3
]}

Campbell, S. L. ^{[1
,2
,3
]}

Hutson, R. B. ^{[1
,2
,3
]}

Marti, G. E. ^{[1
,2
,3
]}

Bloom, B. J. ^{[1
,2
,3
]}

McNally, R. L. ^{[1
,2
,3
]}

Zhang, W. ^{[1
,2
,3
]}

Barrett, M. D. ^{[1
,2
,4
]}

Safronova, M. S. ^{[5
,6
,7
]}

Strouse, G. F. ^{[8
]}

Tew, W. L. ^{[8
]}

Ye, J. ^{[1
,2
,3
]}

机构：

[1] Univ Colorado, NIST, Joint Inst Lab Astrophys, Boulder, CO 80309 USA

[2] Univ Colorado, Boulder, CO 80309 USA

[3] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[4] Ctr Quantum Technol, Singapore 117543, Singapore

[5] Univ Delaware, Newark, DE 19716 USA

[6] NIST, Joint Quantum Inst, College Pk, MD 20899 USA

[7] Univ Maryland, College Pk, MD 20899 USA

[8] NIST, Gaithersburg, MD 20899 USA

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

基金：

美国国家科学基金会;

关键词：

LATTICE CLOCK; QUANTUM; STANDARD; ENTANGLEMENT; NOISE;

D O I：

10.1038/ncomms7896

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The pursuit of better atomic clocks has advanced many research areas, providing better quantum state control, new insights in quantum science, tighter limits on fundamental constant variation and improved tests of relativity. The record for the best stability and accuracy is currently held by optical lattice clocks. Here we take an important step towards realizing the full potential of a many-particle clock with a state-of-the-art stable laser. Our Sr-87 optical lattice clock now achieves fractional stability of 2.2 x 10 (- 16) at 1 s. With this improved stability, we perform a new accuracy evaluation of our clock, reducing many systematic uncertainties that limited our previous measurements, such as those in the lattice ac Stark shift, the atoms' thermal environment and the atomic response to room-temperature blackbody radiation. Our combined measurements have reduced the total uncertainty of the JILA Sr clock to 2.1 x 10 (- 18) in fractional frequency units.

引用

页数：8

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