Independent high-purity photons created in domain-engineered crystals

Francesco Graffitti*, Peter Barrow, Massimiliano Proietti, Dmytro Kundys, Alessandro Fedrizzi

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

56 Citations (Scopus)
55 Downloads (Pure)


Advanced photonic quantum technology relies on multiphoton interference, which requires bright sources of high-purity photons. Single-photon sources based on nonlinear parametric processes typically require lossy spectral filtering for enhancing the spectral purity of the heralded photons. Here, we implement a novel domain-engineering technique for tailoring the nonlinearity of a parametric down-conversion crystal in order to generate indistinguishable and spectrally pure photons without filtering. We create pairs of independently heralded telecom-wavelength photons with high heralding efficiency (up to 65%) and brightness (4 kHz/mW), and we demonstrate a high lower bound for the indistinguishability 98.7 0.2% and spectral purity 90.7 0.3% via two-photon interference experiments.

Original languageEnglish
Pages (from-to)514-517
Number of pages4
Issue number5
Early online date30 Apr 2018
Publication statusPublished - 20 May 2018

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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