【科技日报】电泵浦片上纠缠量子光源亮度提升6个数量级

Core Insights - The research team from the University of Science and Technology of China has successfully integrated a high-brightness polarization-entangled quantum light source on a chip using a hybrid distributed feedback laser and thin-film lithium niobate photonic chip, marking a significant step towards integrated quantum information processing [1] Group 1: Quantum Light Source Development - The entangled quantum light source is a core resource in quantum information science, traditionally requiring external laser pumps, which limits integration and scalability [1] - The new electric pumping scheme allows for direct current injection on-chip, enhancing the integration and scalability of the entangled source [1] - The research team achieved a brightness of 4.5×10^10 pairs/second/milliwatt and a bandwidth of 73 nanometers, significantly improving brightness by six orders of magnitude and bandwidth by one order compared to previous silicon nitride platform sources [1] Group 2: Performance and Applications - Experimental results show that the entangled source maintains a fidelity greater than 96% across multiple wavelength channels and exhibits wideband multiplexing capabilities [2] - The device dimensions are compact at 15mm x 20mm, demonstrating excellent integration [2] - Potential applications include wavelength division multiplexing for fiber network quantum key distribution, satellite-based quantum communication, and entanglement-based quantum precision measurement [2]