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

Matthew Day, Kaushal Choonee, Zachary Chaboyer, Simon Gross, Michael J Withford, Alastair Sinclair, Graham Marshall
<span title="2021-01-22">2021</span> <i title="IOP Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/7wuk73ioknetnmzdvv7ztt63ky" style="color: black;">Quantum Science and Technology</a> </i> &nbsp;
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
more &raquo; ... ies 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 × 10^-3 and the average insertion loss across all channels is 8dB. The module occupies ∼ 10^4 times less volume than a conventional bulk-optic equivalent and is suited to different ion species.
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