Towards fast and scalable trapped-ion quantum logic with integrated photonics

摘要

Trapped-ion qubits promise certain fundamental advantages for quantum information processing (QIP), owingto their indistinguishability and relatively high isolation from noisy environments. Though these qualities haveallowed demonstrations of the necessary primitives for quantum computation, the complexity of the optical apparatusrequired is a major impediment to implementation at scales where quantum systems offer a clear advantageover classical computers. Here, we build on previous work with trap-integrated waveguide optics, describing designsand simulations for commercial foundry-fabricated ion trap chips with integrated Si_3N_4 waveguides andgrating couplers to implement multi-qubit operations. We detail a design intended to address and implementquantum logic gates between 5 ions in a single register, and a configuration which utilizes the stable on-chippath lengths of waveguide devices to enact a novel fast entangling two-qubit gate. The devices and approachespresented here could form elements of a scalable architecture for trapped-ion QIP.