Reduction of trapped ion anomalous heating by in situ surface plasma cleaning

Abstract

Anomalous motional heating is a major obstacle to scalable quantum information processing with trapped ions. While the source of this heating is not yet understood, several previous studies suggest that surface contaminants may be largely responsible. We demonstrate an improvement by a factor of four in the room-temperature heating rate of a niobium surface electrode trap by in situ plasma cleaning of the trap surface. This surface treatment was performed with a simple homebuilt coil assembly and commercially-available matching network and is considerably gentler than other treatments, such as ion milling or laser cleaning, that have previously been shown to improve ion heating rates. We do not see an improvement in the heating rate when the trap is operated at cryogenic temperatures, pointing to a role of thermally-activated surface contaminants in motional heating whose activity may freeze out at low temperatures.

5 pages, 4 figures

References in corpus (3)

• Scaling and Suppression of Anomalous Quantum Decoherence in Ion Traps
• Suppression of Heating Rates in Cryogenic Surface-Electrode Ion Traps
• Measurement of Ion Motional Heating Rates over a Range of Trap Frequencies and Temperatures

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• Method for Determination of Technical Noise Contributions to Ion Motional Heating
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• Electric field noise in a high-temperature superconducting surface ion trap
• Changes in electric-field noise due to thermal transformation of a surface ion trap
• Chiral-coupling-assisted refrigeration in trapped ions
• Surface-induced decoherence and heating of charged particles
• Surface science motivated by heating of trapped ions from the quantum ground state