Direct Observation of Ion Micromotion in a Linear Paul Trap

Abstract

In this paper, direct observation of micromotion for multiple ions in a laser-cooled trapped ion crystal is discussed along with a novel measurement technique for micromotion amplitude. Micromotion is directly observed using a time-resolving, single-photon sensitive camera that provides both fluorescence and position data for each ion on the nanosecond time scale. Micromotion amplitude and phase for each ion in the crystal are measured, allowing this method to be sensitive to tilts and shifts of the ion chain from the null of the radiofrequency quadrupole potential in the linear trap. Spatial resolution makes this micromotion detection technique suitable for complex ion configurations, including two-dimensional geometries. It does not require any additional equipment or laser beams, and the modulation of the cooling lasers or trap voltages is not necessary for detection, as it is in other methods.

arXiv comment6 pages, 5 figues

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• Micromotion minimization using Ramsey interferometry
• Quantum field theory for multipolar composite bosons with mass defect and relativistic corrections
• Micromotion-Synchronized Pulsed Doppler Cooling of Trapped Ions
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• Efficient site-resolved imaging and spin-state detection in dynamic two-dimensional ion crystals
• Unified laboratory-frame analysis of atomic gravitational-wave sensors
• Study of afterpulsing in optical image intensifiers
• Radio-Frequency Pseudo-Null Induced by Light in an Ion Trap