Speaker
Description
To enhance the capabilities of trapped-ion quantum computers, systems possessing hundreds of qubits are required. In pursuit of this objective, our system combines single-ion addressing with the transport of ion chains in a micro-segmented Paul trap [1]. Our setup will feature two independent laser addressing zones, each capable of performing quantum gates, while shuttling facilitates connectivity between the ions in the two zones [2]. Each zone is designed to address a ten-ion chain, and the segmented electrode architecture allows additional chains to be stored between the addressing regions. This design therefore has the potential to perform quantum algorithms involving multiple chains of ten qubits. Addressing is implemented using a crossed-AOD system, enabling fast beam steering without shifting the beam frequency [3]. The addressing design was simulated to provide a tightly focused beam with minimal aberrations along the entire ion chain, resulting in low nearest-neighbour intensity crosstalk. To improve coherence times, the system will be housed in three layers of mu-metal shielding to suppress magnetic field fluctuations, and the quantisation axis is generated by a temperature-stabilised Halbach coil configuration. This poster presents the current progress on the system, including characterisation measurements of the trap frequencies, qubit and motional coherence times, as well as the motional heating rates. We further compare the simulated and measured addressing crosstalk, as well as the beam profiles for all ten ions.
[1] Ruster, T., et al. Experimental realization of fast ion separation in segmented Paul traps. Physical Review A, 90(3), p.033410, 2014.
[2] Kreppel, F., et al. Quantum circuit compiler for a shuttling-based trapped-ion quantum computer. Quantum, 7, p.1176, 2023.
[3] Chen, Y.L., et al. Low-crosstalk optical addressing system for atomic qubits based on multiple objectives and acousto-optic deflectors. Physical Review Applied, 22(5), p.054003, 2024.
| Academic level | PhD student |
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