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Related Experiment Videos

Dispersion-independent high-visibility quantum interference in ultrafast parametric down-conversion

Atature1, Sergienko, Saleh

  • 1Quantum Imaging Laboratory, Department of Physics, Boston University, 8 Saint Mary's Street, Boston, Massachusetts 02215, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary

We developed a new method to eliminate distinguishability in entangled photon pairs from spontaneous parametric down-conversion. This technique significantly improves quantum interference visibility and aids in creating multiphoton entangled states.

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Area of Science:

  • Quantum optics
  • Photonics
  • Quantum information science

Background:

  • Entangled photon pairs are crucial for quantum information processing.
  • Intrinsic distinguishability typically degrades quantum interference visibility.
  • Spontaneous parametric down-conversion (SPDC) is a common source of entangled photons.

Purpose of the Study:

  • To demonstrate effective removal of intrinsic distinguishability in entangled photons.
  • To enhance quantum interference visibility in SPDC.
  • To enable efficient preparation of multiphoton entangled states.

Main Methods:

  • Utilizing femtosecond spontaneous parametric down-conversion (SPDC).
  • Implementing a novel technique to eliminate photon distinguishability.

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  • Preserving high photon-flux density using long nonlinear crystals.

    • Main Results:

    • Achieved effective removal of intrinsic distinguishability between entangled photons.
    • Recovered high-visibility quantum interference, increasing from 17% to 96%.
    • Maintained high photon-flux density.

    Conclusions:

    • The developed technique successfully enhances quantum interference visibility.
    • This method is a key advancement for generating multiphoton entangled states.
    • The technique is compatible with high-flux photon sources.