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|Author(s):||Nathan D. Lemke; Andrew D. Ludlow; Zeb Barber; Tara M. Fortier; Scott A. Diddams; Yanyi Jiang; Steven R. Jefferts; Thomas P. Heavner; Thomas E. Parker; Christopher W. Oates;|
|Title:||A Spin-1/2 Optical Lattice Clock|
|Published:||August 07, 2009|
|Abstract:||We experimentally investigate an optical clock based on 171Yb (I = 1/2) atoms confined in an optical lattice. We have evaluated all known frequency shifts to the clock transition, including the density-dependent collision shift, with an uncertainty of 0.19 Hz, or 3.6× 10−16 fractionally, limited principally by uncertainty in the blackbody radiation Stark shift. We have measured the absolute clock transition frequency relative to the NIST-F1 Cs fountain clock and find the frequency to be 518 295 836 590 865.7(0.9) Hz.|
|Citation:||Physical Review Letters|
|PDF version:||Click here to retrieve PDF version of paper (263KB)|