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

Day, M L; Choonee, K; Chaboyer, Z; Gross, S; Withford, M J; Sinclair, A G; Marshall, G D (2021) A micro-optical module for multi-wavelength addressing of trapped ions. Quantum Science and Technology, 6 (2). 024007 ISSN 2058-9565

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Microfabricated devices for trapping atomic particles have created new opportunities for exploiting quantum phenomena in fundamental science, engineering and computing. While microfabricated ion traps have advanced considerably, the development of accompanying micro-optical systems for controlling arrays of trapped ions has lagged. Most present systems rely on bulk optics, which limits the number of trapping sites that can be optically addressed in a device. To enable experimental systems of increased complexity, and aid the translation to quantum technology applications, micro-optical systems are required for parallel addressing of multiple trapping sites. Photonic devices with micro-optical elements have been reported for coupling laser radiation to trapped ions, however these are restricted in their efficiency, operating wavelength range and polarisation versatility. Here we report a novel micro-optical assembly that irradiates two spatially separate points, each with a set of three blue (422 nm) and two infrared (1033 nm and 1092 nm) laser beams. A 1D array of ten fibre inputs is remapped by a laser-written waveguide chip to two sets of five outputs. These match a 2D array of diffractive microlenses which focus each beam to its intersection point with a unique k-vector. The device has average insertion losses of 8 dB across all channels and typical relative crosstalk intensities of <2×10^-3 at 422 nm. Realisation of this device required the first demonstration of laser-written waveguides that route blue wavelengths in three-dimensions. The material system enables operation over a wide wavelength range; while designed for 88Sr+ transitions, the principle is applicable to other species.

Item Type: Article
Keywords: trapped ion, diffractive microlens, optical addressing, optical assembly, laser-written optical waveguide, quantum information science, quantum computing, microtrap array
Subjects: Quantum Phenomena > Quantum Information Processing and Communication
Divisions: Quantum Technologies
Identification number/DOI: 10.1088/2058-9565/abdf38
Last Modified: 28 May 2021 14:00
URI: http://eprintspublications.npl.co.uk/id/eprint/9167

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