Full-mode Characterisation of Correlated Photon Pairs Generated in Spontaneous Downconversion

• URL: http://arxiv.org/abs/2103.08689v1
• Date: Mon, 15 Mar 2021 20:17:52 GMT
• Title: Full-mode Characterisation of Correlated Photon Pairs Generated in Spontaneous Downconversion
• Authors: Alessio D'Errico, Felix Hufnagel, Filippo Miatto, Mohammadreza Rezaee, Ebrahim Karimi
• Abstract summary: Spontaneous downconversion is the primary source to generate entangled photon pairs in quantum photonics laboratories. We study the full-mode correlation, on a Laguerre-Gauss basis, between photon pairs generated in a type-I crystal. We also explore the effect of a structured pump beam possessing different spatial modes onto bi-photon spatial correlation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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, polarisation, 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 modes 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.

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