s . at om - p h ] 3 1 Ju l 2 00 6 Precision preparation of strings of trapped neutral atoms

ar X iv : 0 90 6 . 12 19 v 2 [ ph ys ic s . at om - p h ] 2 5 Ju l 2 00 9 Spin - 1 / 2 Optical Lattice Clock

We experimentally investigate an optical clock based on Yb (I = 1/2) atoms confined in an optical lattice. We have evaluated all known frequency shifts to the clock transition, including a densitydependent collision shift, with a fractional uncertainty of 3.4 × 10, limited principally by uncertainty in the blackbody radiation Stark shift. We measured the absolute clock transition frequency rela...

nt - p h / 03 12 06 6 v 1 8 D ec 2 00 3 Performance of quantum phase gates with cold trapped atoms

We examine the performance of a quantum phase gate implemented with cold neutral atoms in microtraps, when anharmonic traps are employed and the effects of finite temperature are also taken into account. Both the anharmonicity and the temperature are found to pose limitations to the performance of the quantum gate. We present a quantitative analysis of the problem and show that the phase gate h...

ar X iv : h ep - p h / 05 07 27 6 v 1 2 5 Ju l 2 00 5 System - size dependence of strangeness production in high - energy A +

We argue that the shape of the system-size dependence of strangeness production in nucleus-nucleus collisions can be understood in a picture that is based on the formation of clusters of overlapping strings. A string percolation model combined with a statistical description of the hadronization yields a quantitative agreement with the data at √ s N N = 17.3 GeV. The model is also applied to RHI...

. at om - p h ] 1 5 Fe b 20 00 Precision Measurement of the Lifetime of the 3 d 2 D 5 / 2 state in 40 Ca +

s . at om - p h ] 1 2 Ju l 2 00 2 Nuclear - polarization correction to the bound - electron g factor in heavy hydrogenlike ions

The influence of nuclear polarization on the bound-electron g factor in heavy hydrogenlike ions is investigated. Numerical calculations are performed for the K-and L-shell electrons taking into account the dominant virtual nuclear excitations. This determines the ultimate limit for tests of QED utilizing measurements of the bound-electron g factor in highly charged ions.