Cross-absorption as a limit to heralded silicon photon pair sources

Chad A. Husko*, Alex S. Clark, Matthew J. Collins, Alfredo De Rossi, Sylvain Combrié, Gaëlle Lehoucq, Isabella Rey, Thomas F. Krauss, Chunle Xiong, Benjamin J. Eggleton

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

1 Citation (Scopus)


In recent years integrated waveguide devices have emerged as an attractive platform for scalable quantum tech- nologies. In contrast to earlier free-space investigations, one must consider additional effects induced by the media. In amorphous materials, spontaneous Raman scattered photons act as a noise source. In crystalline materials two-photon absorption (TPA) and free carrier absorption (FCA) are present at large intensities. While initial observations noted TPA affected experiments in integrated semiconductor devices, at present the nuanced roles of these processes in the quantum regime is unclear. Here, using single photons generated via spontaneous four-wave mixing (SFWM) in silicon, we experimentally demonstrate that cross-TPA (XTPA) between a classical pump beam and generated single photons imposes an intrinsic limit on heralded single photon generation, even in the single pair regime. Our newly developed model is in excellent agreement with experimental results.

Original languageEnglish
Title of host publicationNonlinear Optics and Its Applications VIII and Quantum Optics III
EditorsBenjamin J. Eggleton, Alexander L. Gaeta, Neil G. R. Broderick, Alexander V. Sergienko, Arno Rauschenbeutel, Thomas Durt
Place of PublicationWashington, DC
Number of pages13
ISBN (Electronic)9781628410846
Publication statusPublished - 2014
Externally publishedYes
EventNonlinear Optics and Its Applications VIII; and Quantum Optics III - Brussels, Belgium
Duration: 14 Apr 201416 Apr 2014


OtherNonlinear Optics and Its Applications VIII; and Quantum Optics III


  • Integrated photonics
  • Nonlinear optics
  • Photonic crystals
  • Quantum information
  • Quantum integrated photonics
  • Silicon photonics
  • Single photon sources
  • Two photon absorption


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