Executive Summary : | Single-photon sources are crucial for carrying quantum information and are essential for photonic quantum networks, long-haul data exchange, and optical communication through satellites at mid-infrared wavelengths. These sources offer low atmospheric scattering and absorption, and have applications in medical imaging, quantum meteorology, remote sensing, and quantum lidar. However, single-photon sources at telecom wavelength suffer from uncorrelated photon noise due to the stimulated Raman scattering process and rely on bulk optics, leading to a large footprint and operational issues. There has been no demonstration of fiber-based mid-infrared single-photon sources. This project aims to invent and experimentally demonstrate novel optical fibers with optimum dispersion and birefringence profile to achieve high brightness, efficiency, entanglement fidelity, and stability for single-photon sources at telecom and mid-infrared wavelengths. The project investigator will use their stronghold over fiber design engineering skills to invent fiber designs using the finite element method, offering phase matching and birefringence over the desired wavelength range while suppressing the Raman effect. The optimized fibers will be fabricated using a modified chemical vapor deposition process and fiber drawing, and the rod-in-tube technique will be used where required. Robust and efficient fiberized single-photon sources will be useful for various applications in quantum communication, computing, sensing, and imaging. This proposal has great potential for enabling new domains of quantum technologies and aims to train students with this high-tech technology to contribute to the vision of "Make-in-India." |