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## Overview Chinese scientists have achieved quantum entanglement of cold atoms across a record-breaking 420km, a breakthrough they say lays groundwork for intercity quantum networks (SCMP, August). ## Key Details - According to a paper published in the peer-reviewed journal Physical Review Letters on August 11, the distance was more than four times the previous demonstration record (SCMP, August). - The distance exceeded the threshold at which direct transmission encounters fundamental physical limits, according to the researchers (SCMP, August). - Researchers said the experiment "provides a test bed for studying" quantum networking at intercity scale (SCMP, August). ## Strategic Significance This breakthrough is significant for the global race toward practical quantum communication networks, which have major implications for secure communications, quantum computing interconnects, and potentially quantum-resistant cryptography infrastructure. China has been a global leader in quantum communication research (including satellite-based quantum key distribution), and this result strengthens China's position in the broader US-China technology competition around quantum information science - an area increasingly viewed as strategically important alongside AI and semiconductors. ## Related Context Connects to broader narratives of China's quantum technology advancement, including other Chinese quantum computing milestones (e.g., Hanyuan-2 dual-core quantum computer), and the broader US-China technology competition landscape.