Multimode Ion-Photon Entanglement over 101 Kilometers
Victor L. Krutyanskiy, M. Canteri, Martin Meraner, Vojtech Krcmarsky, B. P. Lanyon · PRX Quantum · 2024
A three-qubit quantum network node based on trapped atomic ions is presented.The ability to establish entanglement between each individual qubit in the node and a separate photon that has traveled over a 101km-long optical fiber is demonstrated.By sending those photons through the fiber in close succession, a remote entanglement rate is achieved that is greater than when using only a single qubit in the node.Once extended to more qubits, this multimode approach can be a useful technique to boost entanglementdistribution rates in future long-distance quantum networks of light and matter.