中国科研团队研发出新型量子纠缠光源

Core Insights - A new spontaneous two-photon radiation scheme has been proposed by a team from Sun Yat-sen University, achieving a fidelity of 99.4% for a demand-triggered quantum entangled light source, published in Nature [1][2] Group 1: Research Breakthrough - The research introduces a novel cavity-induced spontaneous two-photon radiation scheme that matches the intensity of single-photon radiation, challenging the traditional understanding that two-photon radiation is inherently weaker than single-photon processes [2] - The team utilized a solid-state "artificial atom" structure at the nanoscale to enhance the probability of emitting two correlated photons simultaneously, a phenomenon known as spontaneous two-photon radiation [1][2] Group 2: Technological Advancements - Advances in semiconductor material growth and device processing technologies have provided critical support for the experimental realization of spontaneous two-photon radiation [2] - The design of ultra-high-quality optical microcavities has allowed for fine-tuning of the photon generation process, increasing the radiation efficiency of two photons from less than 0.1% to approximately 50% [2] Group 3: Implications for Quantum Technologies - The high fidelity of the entangled photon source indicates significant potential for enhancing the security of quantum communication, reliability of quantum computing, and precision of quantum metrology [2]