We present experimental work performed in a cryogenic apparatus exploiting a segmented ion trap architecture for the implementation of quantum algorithms . The quantum register consists of a linear string of 40Ca+ ions which are individually controlled by tightly focused laser beams perpendicular to the crystal axis. Light is delivered by a waveguide array allowing to individually feed each ion with a separately controlled laser beam.
High-fidelity gate operations require both a stable qubit system and precise control over optical fields. In order to control multiple ions in parallel, we have developed a scalable single ion addressing system based on an array of waveguides matched to the ion positions, making the optical addressing system compact and robust against mechanical noise. What is more, this single ion addressing capability will mitigate the need for ion transport operations and allow for parallel qubit manipulations thereby simplifying the overall computation. In order to improve qubit coherence times we have implemented a set of superconducting coils in a "self-shielding" configuration, which enables the suppression of magnetic field fluctuations at all frequencies down to DC . Ion imaging is performed using a camera with low pixel count with state-detection via FPGA-based image processing. This should allow low-latency readout of many ions in parallel, which is essential for implementing fast feedback required for error-correction. Design considerations and experimental progress will be presented.
This work is supported by IARPA.
 Decaroli, C., Matt, R., Oswald, R., Axline, C., Ernzer, M., Flannery, J., Ragg, S. and Home, J.P., 2021. Design, fabrication and characterization of a micro-fabricated stacked-wafer segmented ion trap with two X-junctions. Quantum Science and Technology, 6(4), p.044001.
 Gabrielse, G. and Tan, J., 1988. Self‐shielding superconducting solenoid systems. Journal of Applied Physics, 63(10), pp.5143-5148.
|Presenter name||Roland Matt|
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