Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Atomic systems in external fields

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 [1].
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)

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