United States, June 23 -- Boeing announced that its Q4S quantum networking satellite system successfully demonstrated high-fidelity entanglement swapping during ground testing on a compact, space-qualified payload. This result marks a major step toward proving quantum networking in orbit. Based on Boeing's analysis of peer-reviewed publications of comparable entanglement-swapping experiments, the payload demonstrated leading performance within the real-world power and weight constraints of spaceflight.The team also completed environmental qualification testing, a series of tests designed to verify that the flight payload can withstand launch stresses and the harsh conditions of space. With the commencement of final spacecraft integration, t...