A micro-optical module for multi-wavelength addressing of trapped ions

Abstract

The control of large-scale quantum information processors based on arrays of trapped ions requires a means to route and focus multiple laser beams to each of many trapping sites in parallel. Here, we combine arrays of fibres, 3D laser-written waveguides and diffractive microlenses to demonstrate the principle of a micro-optic interconnect suited to this task. The module is intended for use with an ion microtrap of 3D electrode geometry. It guides ten independent laser beams with unique trajectories to illuminate a pair of spatially separated target points. Three blue and two infrared beams converge to overlap precisely at each desired position. Typical relative crosstalk intensities in the blue are $3.6\times 10^{-3}$ and the average insertion loss across all channels is $8$dB. The module occupies $\sim 10^4$ times less volume than a conventional bulk-optic equivalent and is suited to different ion species.

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• A Fully Fiber-Integrated Ion Trap for Portable Optical Atomic Clocks
• Two-Dimensional Quasi Periodic Structures for Large-Scale Light Out-coupling with Amplitude, Phase and Polarization Control
• Femtosecond laser written waveguides in sapphire for visible light delivery
• Scalable chip-based 3D ion traps
• Electric Field Distortions in Surface Ion Traps with Integrated Nanophotonics
• Individual addressing of ion qubits with counter-propagating optical frequency combs
• Compatibility of trapped ions and dielectrics at cryogenic temperatures