Physics – Condensed Matter – Materials Science
Scientific paper
2011-07-30
J. Appl. Phys. 110, 104901 (2011)
Physics
Condensed Matter
Materials Science
8 pages, 8 figures
Scientific paper
10.1063/1.3662118
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$^+$ ion trapped 100 $\mu$m 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$^{14}$ photons/cm$^2$/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.
Chuang Isaac L.
Ge Yufei
Herskind Peter F.
Lachenmyer Nathan S.
Low Guang Hao
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