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Nonlinear interaction between single photons.

T Guerreiro1, A Martin1, B Sanguinetti1

  • 1Group of Applied Physics, University of Geneva, 1211 Geneva 4, Switzerland.

Physical Review Letters
|November 8, 2014
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated single photons interacting via nonlinear optics, generating photon triplets. This breakthrough in quantum nonlinear optics enables new quantum communication applications using integrated devices.

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Area of Science:

  • Quantum Information Science
  • Quantum Nonlinear Optics
  • Integrated Photonics

Background:

  • Controlling interactions between single photons is crucial for quantum information science.
  • Nonlinear optical processes are key to manipulating quantum states.
  • Previous methods faced challenges in achieving strong single-photon nonlinearities.

Purpose of the Study:

  • To demonstrate and achieve direct nonlinear interaction between two single photons.
  • To explore the generation of photon triplets using sum-frequency generation.
  • To highlight the potential of integrated quantum nonlinear optics.

Main Methods:

  • Generating single photons using independent parametric down-conversion sources.
  • Combining photons in a nonlinear waveguide.
  • Utilizing sum-frequency generation for photon conversion.

Main Results:

  • Successfully observed nonlinear interaction between two single photons.
  • Directly generated photon triplets.
  • Demonstrated the feasibility of integrated quantum nonlinear optics at telecom wavelengths.

Conclusions:

  • The study showcases a practical method for achieving single-photon-level nonlinear interactions.
  • The direct generation of photon triplets opens avenues for advanced quantum protocols.
  • The use of integrated devices at telecom wavelengths is promising for quantum communication applications like device-independent quantum key distribution.