| Author(s): |
Chin W. Chou; David Hume; J.C. Koelemeij; David J. Wineland; Till P. Rosenband; |
| Title: |
Frequency Comparison of Two High-Accuracy Al+ Optical Clocks |
| Published: |
February 17, 2010 |
| Abstract: |
We have constructed an optical clock with a fractional frequency inaccuracy of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser-cool the Al+ ion and detect its quantum state. The frequency of the 1S0->3P0 clock transition is compared to that of a previously constructed Al+ optical clock with a statistical measurement uncertainty of 7.0e-18. The two clocks exhibit a relative stability of 2.8e-15/ sqrt(tau), and a fractional frequency difference of -1.8e-17, consistent with the accuracy limit of the older clock. |
| Citation: |
Physical Review Letters |
| Volume: |
104 |
| Pages: |
4 pp. |
| Keywords: |
atomic clock;optical clock;high accuracy;aluminum ion;quantum logic |
| Research Areas: |
Physics, Quantum Information |
| PDF version: |
 Click here to retrieve PDF version of paper (195KB) |
