Progress towards a quantum network of ⁴⁰Ca⁺ ions trapped in a fiber-based optical cavity

Quantum computers based on trapped ions offer many advantages for executing quantum algorithms, such as long coherence times, precise qubit control and reconfigurable connectivity. As computations increase in complexity, as well as for applications beyond quantum computing, it will be useful to have a photonic interconnect that can entangle distant ion qubits over geographical distances. A network of entangled qubits may, for example, enable increased measurement sensitivity in sensors or increased security in quantum communication protocols. Here we report on our progress to create high-fidelity and high-rate entanglement between ions and telecom-wavelength photons for long-distance entanglement distribution. In our approach, we plan to use calcium ions trapped in a fiber Fabry-Perot optical cavity that is integrated into a surface-electrode ion trap.