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Related Experiment Videos

Time-bin-modulated biphotons from cavity-enhanced down-conversion.

Christopher E Kuklewicz1, Franco N C Wong, Jeffrey H Shapiro

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|December 13, 2006
PubMed
Summary
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Researchers created a novel biphoton state using cavity-enhanced down-conversion. This new source allows quantum interference modulation, offering a bright and controllable method for generating entangled photons.

Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Photonics

Background:

  • Biphoton states are crucial for quantum information processing.
  • Cavity enhancement can improve the brightness of photon sources.
  • Type-II phase-matched periodically poled KTiOPO4 (PPKTP) crystals are efficient nonlinear media.

Purpose of the Study:

  • To generate a new type of biphoton state.
  • To achieve tunable quantum interference in biphoton states.
  • To develop a spectrally bright and fiber-coupled biphoton source.

Main Methods:

  • Cavity-enhanced spontaneous parametric down-conversion (SPDC) in a type-II phase-matched PPKTP crystal.
  • Introduction of weak intracavity birefringence to control quantum interference.

Related Experiment Videos

  • Characterization of biphoton states via quantum interference measurements.

    • Main Results:

    • Generation of a novel biphoton state with modulated quantum interference (singlet-triplet signatures).
    • Interference modulation is controlled by the arrival-time difference of signal and idler photons.
    • A spectrally bright source with a coincidence rate of 0.7 pairs/s/mW/MHz was achieved.

    Conclusions:

    • The developed cavity-enhanced biphoton source offers a new pathway for generating tunable entangled photons.
    • The source's brightness and controllability are significant advancements for quantum technologies.
    • This method provides a promising platform for applications in quantum communication and computation.