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Laser-induced charging of microfabricated ion traps

Author(s)
Low, Guang Hao; Lachenmyer, Nathan S.; Ge, Yufei; Herskind, Peter F.; Chuang, Isaac L.; Wang, Shannon X.; ... Show more Show less
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Abstract
Electrical charging of metal surfaces due to photoelectric generation of carriers is of concern in trapped ion quantum computation systems, due to the high sensitivity of the ions’ motional quantum states to deformation of the trapping potential. The charging induced by typical laser frequencies involved in Doppler cooling and quantum control is studied here, with microfabricated surface-electrode traps made of aluminum, copper, and gold, operated at 6 K with a single Sr[superscript +] ion trapped 100 μm above the trap surface. The lasers used are at 370, 405, 460, and 674 nm, and the typical photon flux at the trap is 10[superscript 14] photons/cm[superscript 2]/sec. Charging is detected by monitoring the ion’s micromotion signal, which is related to the number of charges created on the trap. A wavelength and material dependence of the charging behavior is observed: Lasers at lower wavelengths cause more charging, and aluminum exhibits more charging than copper or gold. We describe the charging dynamic based on a rate-equation approach.
Date issued
2011-11
URI
http://hdl.handle.net/1721.1/71950
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics; MIT-Harvard Center for Ultracold Atoms
Journal
Journal of Applied Physics
Publisher
American Institute of Physics (AIP)
Citation
Wang, Shannon X. et al. “Laser-induced Charging of Microfabricated Ion Traps.” Journal of Applied Physics 110.10 (2011): 104901. © 2011 American Institute of Physics
Version: Final published version
ISSN
0021-8979
1089-7550

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