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Related Experiment Videos

Subnatural linewidth biphotons with controllable temporal length.

Shengwang Du1, Pavel Kolchin, Chinmay Belthangady

  • 1Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. dus@stanford.edu

Physical Review Letters
|June 4, 2008
PubMed
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Researchers generated biphotons with tunable temporal lengths using electromagnetically induced transparency and slow light. This study observed a Sommerfeld-Brillouin precursor at the biphoton level.

Area of Science:

  • Quantum optics
  • Atomic, molecular, and optical physics

Background:

  • Electromagnetically induced transparency (EIT) enables control over light propagation.
  • Slow light phenomena allow for significant reduction in light speed within a medium.

Purpose of the Study:

  • To generate biphotons with controllable temporal characteristics.
  • To investigate the observation of Sommerfeld-Brillouin precursors at the biphoton level.

Main Methods:

  • Utilizing electromagnetically induced transparency (EIT) in a two-dimensional magneto-optical trap.
  • Employing slow light principles to control biphoton temporal length.
  • Achieving a high optical depth of 62 in the magneto-optical trap.

Main Results:

Related Experiment Videos

  • Generation of biphotons with temporal lengths tunable from 50 to 900 ns.
  • Observation of a subnatural linewidth as small as 0.75 MHz.
  • Detection of a sharp leading edge spike, identified as a Sommerfeld-Brillouin precursor at the biphoton level.

    • Conclusions:

    • Demonstrated precise control over biphoton temporal properties.
    • Extended the observation of Sommerfeld-Brillouin precursors to the quantum domain.
    • Opened new avenues for quantum information processing and quantum metrology.