Abstract
In ion trap quantum information processing, efficient fluorescence collection is critical for fast, high-fidelity qubit detection and ion–photon entanglement. The expected size of future many-ion processors requires scalable light collection systems. We report on the development and testing of a microfabricated surface-electrode ion trap with an integrated high-numerical aperture (NA) micromirror for fluorescence collection. When coupled to a low-NA lens, the optical system is inherently scalable to large arrays of mirrors in a single device. We demonstrate the stable trapping and transport of 40Ca+ ions over a 0.63 NA micromirror and observe a factor of 1.9 enhancement of photon collection compared to the planar region of the trap.
Highlights
Arrays of trapped atomic ions are a promising system for implementing quantum information processing and quantum simulation
We examine a multi-scale fluorescence collection system where high numerical aperture (NA) micromirrors are coupled to a macroscopic, low NA lens for efficient light collection over a large field of view (FOV)
We find that the mirror diameter and radius of curvature can be controlled to within ±2 μm by choosing the appropriate circular aperture size and HNO3 and acetic acid (HNA) etch time
Summary
Arrays of trapped atomic ions are a promising system for implementing quantum information processing and quantum simulation. Ion qubit state-detection relies on efficient collection of laser-induced ion fluorescence [12, 13]. We examine a multi-scale fluorescence collection system where high numerical aperture (NA) micromirrors are coupled to a macroscopic, low NA lens for efficient light collection over a large FOV. An array of these mirrors could be integrated into a large trap, permitting simultaneous collection of light from many ions.
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