Engineered optical nonlinearity for a quantum light source

ORAL

Abstract

Many applications in optical quantum information processing benefit from careful spectral shaping of single-photon wave-packets. By engineering the nonlinearity profile of a poled crystal, we were able to tailor the joint spectral wave-function of photons created in parametric down-conversion. We designed a crystal with an approximately Gaussian nonlinearity profile and confirmed successful wave-packet shaping by two-photon interference experiments. To further explore the underlying spectral correlations in the spectral amplitude, we also measured spatial quantum beating patterns. We numerically show how our method can be applied for attaining one of the currently most important goals of single-photon quantum optics, the creation of pure single photons without spectral correlations.

–

Authors

  • Agata Branczyk

    • The University of Queensland

  • Alessandro Fedrizzi

    • Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia
    • The University of Queensland

  • Tom Stace

    • The University of Queensland

  • Tim Ralph

    • The University of Queensland

  • Andrew White

    • Department of Physics and Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia
    • The University of Queensland