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Optical atomic clocks
Optical atomic clocks represent the state-of-the-art in the frontier of modern measurement science. In this article we provide a detailed review on the development of optical atomic clocks that areExpand
Limit on the present temporal variation of the fine structure constant.
An optical transition frequency at 688 THz in 171Yb+ with a cesium atomic clock is measured and a value for the fractional variation of the frequency ratio f(Yb)/f(Cs) of (-1.2+/-4.4)x10(-15) yr(-1) (1sigma) is found, consistent with zero. Expand
Bloch Oscillations of Atoms in an Optical Potential
The early quantum theory of electrical conductivity in crystal lattices by Bloch and Zener [1,2] led to the striking prediction that a homogeneous static electric field induces an oscillatory ratherExpand
Nuclear laser spectroscopy of the 3.5 eV transition in Th-229
We propose high-resolution laser spectroscopy of the 3.5 eV nuclear transition in Th-229 in isolated atoms. Laser excitation of the nucleus can be detected efficiently in a double-resonance method byExpand
Bloch Oscillations of Atoms in an Optical Potential
Ultracold cesium atoms are prepared in the ground energy band of the potential induced by an optical standing wave and the momentum distribution of Bloch states and effective masses different from the mass of the free atom is measured. Expand
Improved limit on a temporal variation of mp/me from comparisons of Yb+ and Cs atomic clocks.
The frequency of the (2)S1/2→(2)F7/2 electric octupole (E3) transition in (171)Yb(+) is measured against two caesium fountain clocks as f(E3)=642,121,496,772,645.36  Hz with an improved fractional uncertainty of 3.9×10(-16). Expand
Single-Ion Atomic Clock with 3×10(-18) Systematic Uncertainty.
An optical frequency standard based on the E3 transition of a single trapped (171)Yb+ ion is experimentally investigated and a Ramsey-type excitation scheme that provides immunity to probe-induced frequency shifts is utilized. Expand
High-accuracy optical clock based on the octupole transition in 171Yb+.
An optical frequency standard based on the 467 nm electric-octupole reference transition with real-time extrapolation scheme that eliminates the probe-light-induced ac Stark shift of the octupole transition is experimentally investigated. Expand
Sub-Hertz optical frequency comparisons between two trapped 171Yb+ ions.
In the absence of external perturbations the authors find a mean frequency difference between the two trapped ions of 0.26(42) Hz, comparable to the agreement found in the most accurate comparisons between cesium fountain clocks. Expand
Phase transitions of stored laser-cooled ions
Single ions in miniature traps can be imaged by using laser light to stimulate fluorescence radiation. At the same time, radiation pressure can be used to bring them nearly to rest. When a smallExpand