Full-mode characterization of correlated photon pairs generated in spontaneous downconversion

Alessio D’Errico*, Felix Hufnagel, Filippo Miatto, Mohammadreza Rezaee, Ebrahim Karimi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Spontaneous parametric downconversion is the primary source to generate entangled photon pairs in quantum photonics laboratories. Depending on the experimental design, the generated photon pairs can be correlated in the frequency spectrum, polarization, position-momentum, and spatial modes. Exploring the spatial modes’ correlation has hitherto been limited to the polar coordinates’ azimuthal angle, and a few attempts to study Walsh mode’s radial states. Here, we study the full-mode correlation, on a Laguerre–Gauss basis, between photon pairs generated in a type-I crystal. Furthermore, we explore the effect of a structured pump beam possessing different spatial modes onto bi-photon spatial correlation. Finally, we use the capability to project over arbitrary spatial mode superpositions to perform the bi-photon state’s full quantum tomography in a 16-dimensional subspace.

Original languageEnglish
Pages (from-to)2388-2391
Number of pages4
JournalOptics Letters
Volume46
Issue number10
DOIs
Publication statusPublished - 15 May 2021
Externally publishedYes

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