Assessing frequency correlation through a distinguishability measurement
Marco Sbroscia, Ilaria Gianani, Emanuele Roccia, Valeria Cimini, Luca, Mancino, Paolo Aloe, and Marco Barbieri
TL;DR
This paper introduces a practical metrology-based method to estimate frequency correlations in photon pairs, providing a conservative measure of their correlation strength with minimal experimental complexity.
Contribution
It presents a novel, low-demanding experimental approach and a theoretical framework for quantifying frequency correlations in photon pairs.
Findings
Effective estimation of frequency correlations using the proposed method
Quantitative assessment of correlation strength in photon pairs
Applicable to common downconversion photon sources
Abstract
The simplicity of a question such as wondering if correlations characterize or not a certain system collides with the experimental difficulty of accessing such information. Here we present a low demanding experimental approach which refers to the use of a metrology scheme to obtain a conservative estimate of the strength of frequency correlations. Our testbed 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.
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