Micromotion minimisation by synchronous detection of parametrically excited motion

• URL: http://arxiv.org/abs/2107.00056v1
• Date: Wed, 30 Jun 2021 18:41:25 GMT
• Title: Micromotion minimisation by synchronous detection of parametrically excited motion
• Authors: D. P. Nadlinger, P. Drmota, D. Main, B. C. Nichol, G. Araneda, R. Srinivas, L. J. Stephenson, C. J. Ballance, and D. M. Lucas
• Abstract summary: Modulation at close to the motional modes of the trapped particle excites coherent motion whose amplitude linearly depends on the stray field. Only a single laser beam is required to resolve fields in multiple directions.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Precise control of charged particles in radio-frequency (Paul) traps requires minimising excess micromotion induced by stray electric fields. We present a method to detect and compensate such fields through amplitude modulation of the radio-frequency trapping field. Modulation at frequencies close to the motional modes of the trapped particle excites coherent motion whose amplitude linearly depends on the stray field. In trapped-ion experiments, this motion can be detected by recording the arrival times of photons scattered during laser cooling. Only a single laser beam is required to resolve fields in multiple directions. In a demonstration using a $^{88}\mathrm{Sr}^{+}$ ion in a surface electrode trap, we achieve a sensitivity of $0.1\, \mathrm{V}\, \mathrm{m}^{-1}\, /\, \sqrt{\mathrm{Hz}}$ and a minimal uncertainty of $0.015\, \mathrm{V}\, \mathrm{m}^{-1}$.

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