A trapped ion system with integrated optics for logical quantum operations*

Implementing algorithms using quantum error correction in a quantum computer may require on the order of one million physical qubits. Trapped ion systems have shown long lifetimes and exceptional single- and multi-qubit gate fidelities. It will be critical to preserve these high fidelities while creating a scalable trapping and manipulation scheme. With integrated, independent control of trapped ions within a chain, we can limit noise and simplify the sequence of operations required to realize an error-corrected logical qubit. We are implementing two approaches for individual addressing of ⁴⁰Ca⁺ ions in a cryogenic ion trap system; the first involves a fiber array imaged onto an ion string, while the second integrates optical waveguides directly within the ion trap chip. In the same setup, we characterize self-stabilized superconducting magnetic field coils for long-lived coherence. We present designs for operation of multiple trapping zones that could be implemented and interfaced as logical qubits. With such a noise-resilient, configurable system, we aim to demonstrate multi-qubit stabilizer readout towards a powerful ion trap quantum processor.