Core Viewpoint - The research conducted by Professor Liu Jin's team at Sun Yat-sen University presents a novel scheme for cavity-induced spontaneous two-photon emission (STPE), achieving a high fidelity of 99.4% for on-demand triggered quantum entangled light sources, which is expected to revolutionize photon quantum science and technology [2][3]. Group 1 - The study reports a STPE phenomenon with brightness comparable to competitive single-photon radiation, originating from a single semiconductor quantum dot coupled to a high-quality microcavity [3]. - The research team utilized photon statistical measurements to reveal quantum characteristics associated with STPE within a cavity quantum electrodynamics system [3]. - The development of a new type of entangled quantum light source using STPE demonstrates nearly perfect entanglement fidelity (99.4%) and the on-demand photon emission characteristics required for atomic quantum radiation sources [3]. Group 2 - This breakthrough provides critical support for the advancement of next-generation quantum precision measurement technologies and the construction of functional photonic quantum information processing chips [3]. - The findings deepen the understanding of two-photon processes in quantum systems and are expected to empower the development of photon quantum technologies through nonlinear quantum radiation [3].