Related Experiment Video
Updated: Jul 4, 2026
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Ultrabroadband biphotons generated via chirped quasi-phase-matched optical parametric down-conversion
Magued B Nasr1, Silvia Carrasco, Bahaa E A Saleh
1Quantum Imaging Laboratory, Department of Electrical & Computer Engineering, Boston University, Boston, Massachusetts 02215, USA.
Abstract:
We generate ultrabroadband biphotons via the process of spontaneous parametric down-conversion (SPDC) in quasi-phase-matched nonlinear gratings that have a linearly chirped wave vector. By using these ultrabroadband biphotons (300-nm bandwidth), we measure the narrowest Hong-Ou-Mandel dip to date, having a full width at half maximum of 7.1 fs. This enables the generation of a high flux of nonoverlapping biphotons with ultrabroad bandwidth, thereby promoting the use of SPDC light in many nonclassical applications.
