Observation of a nonlocal optical vortex.
We report the observation of an optical vortex in the correlations of photons produced from spontaneous parametric down-conversion. The singularity appears in a nonlocal coordinate plane consisting of 1 degree of freedom of each photon.
Gomes
R M
RM
Instituto de Física, Universidade Federal de Goiás, GO 74.001-970, Brazil.
Salles
A
A
Toscano
F
F
Ribeiro
P H Souto
PH
Walborn
S P
SP