Hybrid quantum processors: Molecular ensembles as quantum memory for solid state circuits

  • Rabl P
  • Demille D
  • Doyle J
 et al. 
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We investigate a hybrid quantum circuit where ensembles of cold polar molecules serve as long-lived quantum memories and optical interfaces for solid state quantum processors. The quantum memory realized by collective spin states (ensemble qubit) is coupled to a high-Q stripline cavity via microwave Raman processes. We show that, for convenient trap-surface distances of a few microm, strong coupling between the cavity and ensemble qubit can be achieved. We discuss basic quantum information protocols, including a swap from the cavity photon bus to the molecular quantum memory, and a deterministic two qubit gate. Finally, we investigate coherence properties of molecular ensemble quantum bits.

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  • P. Rabl

  • D. Demille

  • J. M. Doyle

  • M. D. Lukin

  • R. J. Schoelkopf

  • P. Zoller

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