Laser-induced charging of microfabricated ion traps

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${}^{+}$ 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.

8 pages, 8 figures

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Cited by in corpus (29)

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• Increased surface flashover voltage in microfabricated devices
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• Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave
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• Technologies for trapped-ion quantum information systems
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• Efficient ion-photon qubit SWAP gate in realistic ion cavity-QED systems without strong coupling
• Coupling two laser-cooled ions via a room-temperature conductor
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• Micromotion compensation of trapped ions by qubit transition and direct scanning of dc voltages
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• Electric Field Distortions in Surface Ion Traps with Integrated Nanophotonics