Experimental techniques for 100+ qubits in a linear ion trap

Trapped atomic ions is a prime platform for quantum simulations and quantum computing, While the fidelities are highest, scaling up the system size beyond a few dozen qubits remain as challenges. Here, we demonstrate experimental techniques for confining more than a hundred Be+ ions, a species with several important advantages: the light-mass permits fast spin-spin interaction with high fidelities; higher secular frequencies under the same trap q parameter, which is more sustainable for holding a long chain and mitigate the difficulties in trap fabrication. We demonstrate scalable techniques: fast and reliable loading of defect-free Be+ with laser ablation; high numerical aperture diffraction-limited microscope adaptable for deep ultraviolet to infrared wavelengths; and a room-temperature vacuum system the level of 10^-12 Torr. Finally, we discuss novel parallel entangling gates beyond the existing schemes.