Linking trapped-ion quantum nodes

Future quantum networks offer a promising route to quantum-secure communication, distributed quantum computing, and quantum-enhanced sensing. The applications of a given network will depend on the capabilities available at its nodes, which may be as simple as quantum state generation and measurement or as advanced as a universal quantum computer. Here, we focus on quantum nodes based on calcium ions confined in a linear Paul trap, an experimental platform with which high-fidelity state preparation, gate operations, and readout have been demonstrated.

By coupling trapped ions to the mode of an optical resonator, we construct a coherent interface between single ions and single photons. I will present ongoing work to transfer photonic quantum states between two remote trapped-ion systems, highlighting the experimental challenges and identifying the key components for scaling up such links into networks.