A team in China has significantly advanced atom entanglement, achieving a record distance of 420km using rubidium atoms. This breakthrough, published in Physical Review Letters, quadruples previous entanglement distances and surpasses fundamental physical limits for direct transmission. The research utilized two quantum memory units connected by optical fiber, aiming to create a foundation for scalable quantum communications and computing. AI
RANK_REASON Publication of a scientific paper detailing a research breakthrough. [lever_c_demoted from research: ic=1 ai=0.1]
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