6 research outputs found
State detection using coherent Raman repumping and two-color Raman transfers
We demonstrate state detection based on coherent Raman repumping and a
two-color Raman state transfer. The Raman coupling during detection selectively
eliminates unwanted dark states in the fluorescence cycle without compromising
the immunity of the desired dark state to off-resonant scattering. We
demonstrate this technique using where a combination of
Raman coupling and optical pumping leaves the
metastable state optically dark and immune to off-resonant scattering. All
other states are strongly coupled to the upper levels. We achieve a
single shot state-detection efficiency of in a
integration time, limited almost entirely by technical imperfections. Shelving
to the state before detection is performed via a two-color
Raman transfer with a fidelity of
Spectroscopy on a single trapped 137Ba+ ion for nuclear magnetic octupole moment determination
We present precision measurements of the hyperfine intervals in the 5D3/2
manifold of a single trapped Barium ion, 137 Ba+ . Measurements of the
hyperfine intervals are made between mF = 0 sublevels over a range of magnetic
fields allowing us to interpolate to the zero field values with an accuracy
below a few Hz, an improvement on previous measurements by three orders of
magnitude. Our results, in conjunction with theoretical calculations, provide a
30-fold reduction in the uncertainty of the magnetic dipole (A) and electric
quadrupole (B) hyperfine constants. In addition, we obtain the magnetic
octupole constant (C) with an accuracy below 0.1 Hz. This gives a subsequent
determination of the nuclear magnetic octupole moment, {\Omega}, with an
uncertainty of 1% limited almost completely by the accuracy of theoretical
calculations. This constitutes the first observation of the octupole moment in
137 Ba+ and the most accurately determined octupole moment to date.Comment: 4 pages, 3 figure