Broadband biphotons in a single spatial mode

TL;DR

This paper presents an experimental method to generate broadband biphotons in a single spatial mode using dispersive elements and mode filtering, enabling improved control over quantum light sources.

Contribution

The authors introduce a novel technique combining dispersive optics and single-mode fiber coupling to produce spatially single-mode broadband biphotons.

Findings

Successful generation of broadband biphotons in a single spatial mode

Precise control of the frequency angular spectrum using dispersive elements

Potential applications in quantum information processing

Abstract

We demonastrate experimental technique for generating spatially single-mode broadband biphoton field. The method is based on dispersive optical element which precisely tailors the structure of type-I SPDC frequency angular spectrum in order to shift different spectral components to a single angular mode. Spatial mode filtering is realized by coupling biphotons into a single-mode optical fiber.