Compatibility of trapped ions and dielectrics at cryogenic temperatures

2025/06/18 by Bruff, M., Sonderhouse, L., David, K. N. +3 · 1 citation
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2506.15057

Abstract

We study the impact of an unshielded dielectric \unicodex2013 here, a bare optical fiber \unicodex2013 on a ⁴⁰Ca⁺ ion held several hundred μm away in a cryogenic surface electrode trap. We observe distance-dependent stray electric fields of up to a few kV/m due to the dielectric, which drift on average less than 10% per month and can be fully compensated with reasonable voltages on the trap electrodes. We observe ion motional heating rates attributable to the dielectric of ≈30 quanta per second at an ion-fiber distance of 215(4) μm and ≈1.5 MHz motional frequency. These results demonstrate the viability of using unshielded, trap-integrated dielectric objects such as miniature optical cavities or other optical elements in cryogenic surface electrode ion traps.

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• Characterization of Inner Control Electrode Shapes for Multi-Layer Surface-Electrode Ion Traps

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