
#1
Sep413, 08:18 PM

Astronomy
Sci Advisor
PF Gold
P: 22,796

This was just posted today, and looks interesting
http://arxiv.org/pdf/1309.1137.pdf A New Generation of Atomic Clocks: Accuracy and Stability at the 10^{18} Level B. J. Bloom et al The exquisite control exhibited over quantum states of individual particles has revolutionized the field of precision measurement, as exemplified by the most accurate atomic clock realized in single trapped ions. Whereas manyatom lattice clocks have shown advantages in measurement precision over trappedion clocks, their accuracy has remained 20 times worse. Here we demonstrate, for the first time, that a manyatom system achieves accuracy (6x10^{18)} better than a single ionbased clock, with vastly reduced averaging times (3000 s). This is the first time a single clock has achieved the best performance in all three key ingredients necessary for consideration as a primary standard  stability, reproducibility, and accuracy. This work paves the way for future experiments to integrate manybody quantum state engineering into the frontiers of quantum metrology, creating exciting opportunities to advance precision beyond the standard quantum limit. Improved frequency standards will have impact to a wide range of fields from the realization of the SI units, the development of quantum sensors, to precision tests of the fundamental laws of nature.  National Institute of Standards and Technology and University of Colorado, Boulder, CO 



#2
Sep413, 08:47 PM

Mentor
P: 15,571

As you can see, we're starting to come up against the wall with atomic clocks. The next step will be nuclear clocks, built around the Th229m isomer. This is predicted to have a Qvalue about a thousand times better than the best atomic clocks, and much better environmental isolation since its a nuclear (not atomic) transition. The "gamma" from this transition is very, very soft  it's actually in the ultraviolet.




#4
Sep513, 10:14 AM

Sci Advisor
PF Gold
P: 2,197

A New Generation of Atomic Clocks 


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