Quantum microwave-optical interface with nitrogen-vacancy centers in diamond

  1. Bo Li,
  2. Peng-Bo Li,
  3. Yuan Zhou,
  4. Sheng-Li Ma,
  5. and Fu-Li Li
We propose an efficient scheme for a coherent quantum interface between microwave and optical photons using nitrogen-vacancy (NV) centers in diamond. In this setup, an NV center ensemble
is simultaneously coupled to an optical and a microwave cavity. We show that, by using the collective spin excitation modes as an intermediary, quantum states can be transferred between the microwave cavity and the optical cavity through either a double-swap scheme or a dark-state protocol. This hybrid quantum interface may provide interesting applications in single microwave photon detections or quantum information processing.