Towards a 16-qubit trapped barium ion testbed.

We present our progress towards trapping and manipulating Ba-133 ions on a surface trap. The [KI1] vacuum chamber (4E-11 mbar) provides high NA optical access from multiple directions for fluorescence collection and optical manipulation in a Phoenix surface trap fabricated by Sandia National Laboratories. Visible wavelength atomic transitions in Ba+ offer unique possibilities to adapt waveguide optics for modularity and scalability. We demonstrate a single-qubit optical addressing scheme with independent amplitude, frequency, and phase control and low (~1E-4) relative intensity crosstalk at the location of neighboring qubits. This scheme leverages laser-written waveguides, fiber modulators, and microlens arrays. We also present results from our effort to create efficient laser-ablated atomic sources for radioactive Ba-133 ions.