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.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Zeferino Ibarra-Borja, Roberto Ramírez-Alarcón, Carlos Sevilla-Gutiérrez, Hector Cruz-Ramírez, and Alfred B. U’Ren
OSA Continuum 4(8) 2210-2220 (2021)
Pauline Boucher, Hugo Defienne, and Sylvain Gigan
Opt. Lett. 46(17) 4200-4203 (2021)
Masaya Arahata, Yu Mukai, Bo Cao, Toshiyuki Tashima, Ryo Okamoto, and Shigeki Takeuchi
J. Opt. Soc. Am. B 38(6) 1934-1941 (2021)