Phys.org May 15, 2024
A team of researchers in the US (MIT, Harvard University, industry) demonstrated a two-node quantum network composed of multi-qubit registers based on silicon-vacancy (SiV) centres in nanophotonic diamond cavities integrated with a telecommunication fibre network. Remote entanglement was generated by the cavity-enhanced interactions between the electron spin qubits of the SiVs and optical photons. Serial spin-photon entangling gate operations with time-bin qubits were used for robust entanglement of separated nodes. Long-lived nuclear spin qubits were used to provide second-long entanglement storage and integrated error detection. By integrating efficient bidirectional quantum frequency conversion of photonic communication qubits to telecommunication frequencies (1,350 nm), they demonstrated the entanglement of two nuclear spin memories through 40 km spools of low-loss fibre and a 35-km long fibre loop deployed in the Boston area urban environment… read more. Open Access TECHNICAL ARTICLE
A two-node quantum network of cavity-coupled solid-state emitters. Credit: Nature volume 629, pages573–578, 15 May, 2024