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Electrical charging of metal surfaces due to photoelectric generation ofcarriers is of concern in trapped ion quantum computation systems, due to thehigh sensitivity of the ions' motional quantum states to deformation of thetrapping potential. The charging induced by typical laser frequencies involvedin doppler cooling and quantum control is studied here, with microfabricatedsurface electrode traps made of aluminum, copper, and gold, operated at 6 Kwith a single Sr$^+$ ion trapped 100 $\mu$m above the trap surface. The lasersused are at 370, 405, 460, and 674 nm, and the typical photon flux at the trapis 10$^{14}$ photons/cm$^2$/sec. Charging is detected by monitoring the ion'smicromotion signal, which is related to the number of charges created on thetrap. A wavelength and material dependence of the charging behavior isobserved: lasers at lower wavelengths cause more charging, and aluminumexhibits more charging than copper or gold. We describe the charging dynamicbased on a rate equation approach.

Laser-induced charging of microfabricated ion traps