Cooling atomic ions with visible and infra-red light

We demonstrate the ability to load, cool and detect singly charged calcium ions in a surface electrode trap using only visible and infrared lasers for the trapped-ion control. As opposed to the standard methods of cooling using dipole-allowed transitions, we combine power broadening of a quadrupole...

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Bibliographic Details
Published in:New journal of physics 2017-06, Vol.19 (6), p.63041
Main Authors: Lindenfelser, F, Marinelli, M, Negnevitsky, V, Ragg, S, Home, J P
Format: Article
Language:English
Subjects:
Atomic beams
Calcium ions
Charging
Cooling
Data processing
Dielectrics
Dipoles
Fluorescence
Infrared lasers
laser cooling
Optical waveguides
Physics
Quadrupoles
quantum optics
Quantum phenomena
Quenching
trapped ions
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Summary:We demonstrate the ability to load, cool and detect singly charged calcium ions in a surface electrode trap using only visible and infrared lasers for the trapped-ion control. As opposed to the standard methods of cooling using dipole-allowed transitions, we combine power broadening of a quadrupole transition at 729 nm with quenching of the upper level using a dipole allowed transition at 854 nm. By observing the resulting 393 nm fluorescence we are able to perform background-free detection of the ion. We show that this system can be used to smoothly transition between the Doppler cooling and sideband cooling regimes, and verify theoretical predictions throughout this range. We achieve scattering rates which reliably allow recooling after collision events and allow ions to be loaded from a thermal atomic beam. This work is compatible with recent advances in optical waveguides, and thus opens a path in current technologies for large-scale quantum information processing. In situations where dielectric materials are placed close to trapped ions, it carries the additional advantage of using wavelengths which do not lead to significant charging, which should facilitate high rate optical interfaces between remotely held ions.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/aa7150