Entanglement of nanophotonic quantum memory nodes in a telecom network

Abstract A key challenge in realizing practical quantum networks for long-distance quantum communication involves robust entanglement between quantum memory nodes connected by fibre optical infrastructure 1–3 . Here we demonstrate 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 is generated by the cavity-enhanced interactions between the electron spin qubits of the SiVs and optical photons. Serial, heralded spin-photon entangling gate operations with time-bin qubits are used for robust entanglement of separated nodes. Long-lived nuclear spin qubits are used…

• NS
  National Science Foundation

  Awards: 2025158, PHY-2012023, EEC-1941583, 2012023, 2317134, 1941583, 5710004174
• NA
  National Aeronautics and Space Administration
• MU
  Multidisciplinary University Research Initiative

  Awards: FA95501610323, FA9550171002
• DO
  Division of Emerging Frontiers in Research and Innovation

  Award: 5710004174
• AF
  Air Force Office of Scientific Research

  Awards: FA95501610323, EEC-1941583, FA9550171002