High accuracy measure of atomic polarizability in an optical lattice clock

Details High accuracy measure of atomic polarizability in an optical lattice clock High accuracy measure of atomic polarizability in an optical lattice clock

2011-12-13

arxiv.org/abs/1112.2766v1

Phys. Rev. Lett. 108, 153002 (2012)

Physics

Atomic Physics

5 pages, 3 figures, 2 tables

Scientific paper

10.1103/PhysRevLett.108.153002

Despite being a canonical example of quantum mechanical perturbation theory, as well as one of the earliest observed spectroscopic shifts, the Stark effect contributes the largest source of uncertainty in a modern optical atomic clock through blackbody radiation. By employing an ultracold, trapped atomic ensemble and high stability optical clock, we characterize the quadratic Stark effect with unprecedented precision. We report the ytterbium optical clock's sensitivity to electric fields (such as blackbody radiation) as the differential static polarizability of the ground and excited clock levels: 36.2612(7) kHz (kV/cm)^{-2}. The clock's fractional uncertainty due to room temperature blackbody radiation is reduced an order of magnitude to 3 \times 10^{-17}.

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