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Hybrid quantum processors: molecular ensembles as quantum memory for solid state circuits.

P Rabl1, D DeMille, J M Doyle

  • 1Institute for Theoretical Physics, University of Innsbruck, and Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria.

Physical Review Letters
|August 16, 2006
PubMed
Summary
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We developed a hybrid quantum circuit using cold polar molecules as quantum memories. This system enables strong coupling for quantum information processing and demonstrates key protocols like qubit swapping and gates.

Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Molecular Physics

Background:

  • Solid-state quantum processors require robust quantum memories.
  • Cold polar molecules offer potential for long-lived quantum memory.
  • Integrating molecular systems with solid-state devices is challenging.

Purpose of the Study:

  • To investigate a hybrid quantum circuit combining cold polar molecules and solid-state components.
  • To demonstrate the feasibility of using molecular ensembles as quantum memories.
  • To explore quantum information protocols within this hybrid system.

Main Methods:

  • Utilizing ensembles of cold polar molecules as collective spin states (ensemble qubits).
  • Coupling the molecular ensemble qubit to a high-Q stripline cavity via microwave Raman processes.

Related Experiment Videos

  • Investigating quantum information protocols such as photon-molecule swapping and two-qubit gates.

    • Main Results:

    • Achieved strong coupling between the cavity and the ensemble qubit at micrometer trap-surface distances.
    • Demonstrated a successful swap of quantum information from a cavity photon bus to the molecular quantum memory.
    • Showcased a deterministic two-qubit gate operation.
    • Investigated the coherence properties of molecular ensemble qubits.

    Conclusions:

    • Hybrid quantum circuits with cold polar molecules are promising for quantum information processing.
    • Strong coupling and basic quantum protocols are achievable, paving the way for advanced applications.
    • Molecular ensemble qubits offer a viable platform for long-lived quantum memory in solid-state quantum processors.