Observations of Dispersion Cancellation of Entangled Photon Pairs

TL;DR

This paper experimentally demonstrates dispersion cancellation in frequency-entangled photon pairs using time-resolved up conversion, achieving ultrashort biphotons with high temporal resolution and significant dispersion robustness.

Contribution

It presents the first experimental observation of dispersion cancellation in entangled photon pairs with fs-level temporal resolution and high dispersion sensitivity.

Findings

Dispersion cancellation demonstrated with >1000 fs^2 dispersion.

Achieved biphoton correlation width as small as 6.8 optical periods.

Utilized time-resolved up conversion for ultrashort biphoton characterization.

Abstract

An experimental study of the dispersion cancellation occurring in frequency-entangled photon pairs is presented. The approach uses time-resolved up conversion of the pairs, which has temporal resolution at the fs level, and group-delay dispersion sensitivity of $\approx \ 20 \, \mathrm{fs}^2$ under experimental conditions. The cancellation is demonstrated with dispersion stronger than $\pm 10^3 \, \mathrm{fs}^2$ in the signal $(-)$ and idler $(+)$ modes. The observations represent the generation, compression, and characterization of ultrashort biphotons with correlation width as small as 6.8 times the degenerate optical period.