Assessing frequency correlation through a distinguishability measurement
Marco Sbroscia, Ilaria Gianani, Emanuele Roccia, Valeria Cimini, Luca Mancino, Paolo Aloe, Marco Barbieri · Optics Letters · 2018
The simplicity of a question, such as wondering whether or not correlations characterize a certain system, collides with the experimental difficulty of accessing such information. Here we present a low-demanding experimental approach that refers to the use of a metrology scheme to obtain a conservative estimate of the strength of frequency correlations. Our test bed is the widespread case of a photon pair produced per downconversion. The theoretical architecture used to put the correlation degree on a quantitative ground is also described.