Core Viewpoint - The research team from Sun Yat-sen University has achieved a significant breakthrough in spontaneous two-photon radiation, developing a new type of micro-nano quantum entangled light source with a fidelity of 99.4%, which is expected to enhance quantum precision measurement technology and the construction of functional optical quantum information processing chips [1][2]. Group 1 - The team proposed a novel cavity-induced spontaneous two-photon radiation scheme, achieving spontaneous two-photon radiation intensity comparable to single-photon radiation for the first time internationally [1][2]. - The efficiency of two-photon radiation was improved from less than 0.1% to approximately 50% through the design of high-quality optical microcavities, enabling the creation of controllable entangled photon pair sources [1]. - The research is based on nano-sized solid-state "artificial atom" structures, indicating a significant advancement in the field of two-photon research [2]. Group 2 - The high fidelity of 99.4% suggests a strong "telepathic" effect of the entangled photons, showcasing the technology's potential in enhancing quantum communication security, quantum computing reliability, and quantum measurement precision [2]. - Reviewers from the journal Nature have recognized this work as a breakthrough in the field of two-photon research, noting the record-breaking fidelity of the entangled photon pairs [2].