Bright ultra-broadband fiber-based biphoton source.

• DOI: 10.48550/arxiv.2403.08571
• Publication Date: 2024-07-02
• Authors: Maksim A. Smirnov; Ilya V. Fedotov; Anastasia M. Smir...; Albert F. Khairullin; Andrei B. Fedotov; Sergey A. Moiseev
• Keywords: FOS: Physical sciences; 02 engineering and technology; 0210 nano-technology; Physics - Optics; Optics (physics.optics)

In this Letter, we report a first, to the best of our knoqledge, experimental realization of a bright ultra-broadband (180 THz) fiber-based biphoton source with widely spectrally separated signal and idler photons. Such a two-photon source is realized due to the joint use of a broadband two-loop phase-matching of interacting light waves and high optical nonlinearity of a silica-core photonic crystal fiber. The high performance of the developed fiber source identifies it as an important and useful tool for a wide range of optical quantum applications.