Interfacing superconducting qubits and single optical photons using   molecules in waveguides
  We propose an efficient light-matter interface at optical frequencies between a single photon and a superconducting qubit. The desired interface is based on a hybrid architecture composed of an organic molecule embedded inside an optical waveguide and electrically coupled to a superconducting qubit placed near the outside surface of the waveguide. We show that high fidelity, photon-mediated, entanglement between distant superconducting qubits can be achieved with incident pulses at the single photon level. Such a low light level is highly desirable for achieving a coherent optical interface with superconducting qubit, since it minimizes decoherence arising from the absorption of light. 
Sumanta Das, Vincent E. Elfving, Sanli Faez, Anders S. S{\o}rensen
quant-ph cond-mat.mes-hall physics.optics