Hybrid Atom–Photon Quantum Gate in a Superconducting Microwave Resonator

  1. J. D. Pritchard,
  2. J. A. Isaacs,
  3. M. A. Beck,
  4. R. McDermott,
  5. and M. Saffman
We propose a novel hybrid quantum gate between an atom and a microwave photon in a superconducting coplanar waveguide cavity by exploiting the strong resonant microwave coupling between adjacent Rydberg states. Using experimentally achievable parameters gate fidelities >0.99 are possible on sub-μs timescales for waveguide temperatures below 40 mK. This provides a mechanism for generating entanglement between two disparate quantum systems and represents an important step in the creation of a hybrid quantum interface applicable for both quantum simulation and quantum information processing.
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