Fiber optic laser delivery system for planar ion traps

The use of trapped ions for quantum computation requires precise focusing and alignment of lasers for cooling the ions and performing logic gates. On-trap fiber optics would eliminate the need for alignment of lasers to the traps and allow scaling of surface-electrode ion traps on large chips to smaller sizes. We have developed a design for implementing on-trap fiber optics with an integrated beam focusing lens using microfabrication techniques. The design uses SU-8 photoresist structures to align the fiber and focusing lens to the trap. We present details of the design and the results of preliminary testing.