Highly Efficient Biphoton Generation from Thin Dense Atomic Ensemble

Highly Efficient Biphoton Generation In article number 2400214, Han Seb Moon, Heewoo Kim, and Hansol Jeong present a highly efficient biphoton source using a thin and dense atomic medium from a hot 1 mm-long Cs atomic vapor cell, which paves the way for scalable quantum networks. Demonstrating the viability of such atomic sources at the millimeter scale marks a significant milestone, driving the miniaturization of quantum technologies and advancing light-matter interfaces.