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Updated: Aug 7, 2026
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Dispersion-independent high-visibility quantum interference in ultrafast parametric down-conversion
1Quantum Imaging Laboratory, Department of Physics, Boston University, 8 Saint Mary's Street, Boston, Massachusetts 02215, USA.
Physical Review Letters
|October 4, 2000
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.
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.
- 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.
