Check out this talk by Daniel Slichter
Trapped atomic ions are a leading quantum platform, offering excellent coherence properties, high-fidelity qubit control and readout, and reconfigurable qubit connectivity. Qubit state control is typically performed using laser beams delivered to the ions via free-space optics, and readout generally relies on ion fluorescence photon collection using high-numerical-aperture objectives. Both of these methods perform well, but present challenges for scaling to large numbers of qubits. In my talk, I will describe some of our efforts toward integrating both control and readout functionality into microfabricated ion trap chips, opening potential avenues for improved scalability.