Design considerations for high-purity heralded single-photon sources

Francesco Graffitti*, Jérémy Kelly-Massicotte, Alessandro Fedrizzi, Agata M. Brańczyk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)
214 Downloads (Pure)


When building a parametric down-conversion photon-pair source with spectrally separable photons, e.g., for making high-purity heralded single photons, two practical issues must be accounted for: the design of the experiment, and its characterization. To address experiment design, we study the impact on spectral separability of realistic (sech-shaped and chirped) pump fields, realistic nonlinear crystals with fabrication imperfections, and undesirable PDC generation far from the central PMF peak coming from nonlinearity shaping methods. To address experiment characterization, we study the effect of discretization and spectral range of the measured biphoton joint spectrum, the difference between inferring separability from the joint spectral amplitude versus the joint spectral intensity, and advantages of interference experiments for purity characterization over methods based on the joint spectral intensity. This study will be of practical interest to researchers building the next generation of nonlinear sources of separable photon pairs.

Original languageEnglish
Article number053811
JournalPhysical Review A
Issue number5
Publication statusPublished - 7 Nov 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Design considerations for high-purity heralded single-photon sources'. Together they form a unique fingerprint.

Cite this