Heidelberg 2015 – wissenschaftliches Programm
A 5.4: Vortrag
Montag, 23. März 2015, 15:15–15:30, C/kHS
Controlling the magnetic-field sensitivity of atomic-clock states by microwave dressing — •Lörinc Sárkány, Helge Hattermann, and József Fortágh — CQ Center for Collective Quantum Phenomena and their Applications, Physikalisches Institut, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
The sensitivity of atomic transitions to external field perturbations represents a major limitation for the accuracy
and stability of atomic clocks and for the time of
quantum-information storage in ultracold atoms and atomic
gases. Electromagnetic field fluctuations and inhomogeneous trapping potentials give rise to temporal and spatial variations of atomic transition frequency.
We demonstrate control of the differential Zeeman shift between clock states of ultracold rubidium atoms by means of nonresonant microwave dressing. By dressing the state pair 5S1/2 F= 1, mF = −1 and F= 2, mF = 1, a residual frequency spread of <0.1 Hz in a range of 100 mG around a chosen magnetic offset field can be achieved .
We further identify double magic points, around which the clock frequency is insensitive to fluctuations both in the magnetic field and the dressing Rabi frequency. The technique is compatible with chip-based cold atom systems and allows the creation of clock and qubit states with reduced sensitivity to magnetic field noise.
L. Sárkány et al., Phys. Rev. A 90, 053416 (2014)