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Polarization-controlled single photons.

T Wilk1, S C Webster, H P Specht

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Researchers generated single photons with alternating polarization using rubidium-87 atoms and an optical cavity. This method achieves high repetition rates without atom recycling, enabling efficient single-photon generation for quantum applications.

Area of Science:

  • Quantum optics
  • Atomic physics
  • Cavity quantum electrodynamics

Background:

  • Single photon sources are crucial for quantum information processing.
  • Generating indistinguishable photons at high rates is a key challenge.
  • Raman transitions in atoms coupled to optical cavities offer a promising route.

Purpose of the Study:

  • To develop a method for generating single photons with controlled polarization.
  • To achieve high repetition rates for photon generation.
  • To demonstrate the indistinguishability of the generated photons.

Main Methods:

  • Utilizing vacuum-stimulated Raman transitions in a rubidium-87 atom.
  • Coupling the atom to a high-finesse optical cavity.
  • Applying a magnetic field to lift state degeneracy.

Related Experiment Videos

  • Using alternating laser pulses to drive transitions.
  • Employing time-resolved two-photon interference to test indistinguishability.

    • Main Results:

    • A stream of single photons with alternating circular polarization was produced.
    • The photons were generated in a specific spatiotemporal mode.
    • MHz repetition rates were achieved due to the absence of atom recycling.
    • Photon indistinguishability was confirmed through interference measurements.

    Conclusions:

    • The demonstrated technique provides an efficient method for generating polarization-entangled single photons.
    • The high repetition rates and indistinguishability make this source suitable for quantum communication and computation.
    • Cavity-enhanced atomic transitions offer a scalable approach to quantum light sources.