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Effective spin systems in coupled microcavities.

Michael J Hartmann1, Fernando G S L Brandão, Martin B Plenio

  • 1Institute for Mathematical Sciences, Imperial College London, SW7 2PG, United Kingdom. m.hartmann@imperial.ac.uk

Physical Review Letters
|November 13, 2007
PubMed
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Atoms in microcavities simulate a tunable spin-1/2 lattice. This robust quantum model, using virtual photons, is feasible with current technology and can create cluster states.

Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Atomic physics

Background:

  • Quantum simulation requires controllable systems to model complex phenomena.
  • Interactions mediated by virtual photons offer a promising avenue for quantum control.
  • Anisotropic Heisenberg spin models are fundamental in understanding magnetism and quantum entanglement.

Purpose of the Study:

  • To demonstrate a novel quantum simulation platform using atoms in microcavities.
  • To engineer an anisotropic Heisenberg spin-1/2 lattice model.
  • To investigate the feasibility and robustness of this system for quantum state generation.

Main Methods:

  • Trapping neutral atoms within optical microcavities.
  • Utilizing virtual photon exchange between atoms for spin interactions.

Related Experiment Videos

  • Employing external lasers to tune Hamiltonian parameters and control spin states.
  • Leveraging suppressed excited state populations for enhanced coherence.

    • Main Results:

    • Successfully modeled an anisotropic Heisenberg spin-1/2 lattice in an external magnetic field.
    • Demonstrated individual tunability of all effective Hamiltonian parameters via lasers.
    • Showcased robustness against decoherence due to suppressed excited state occupations.
    • Confirmed long lifetime and feasibility with current experimental technology.

    Conclusions:

    • Atoms in microcavities provide a robust and tunable platform for quantum simulation.
    • The developed model is a feasible approach for generating cluster states.
    • This work paves the way for advanced quantum information processing applications.