Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory by Michael R Sprague, Duncan G England, Amir Abdolvand, Joshua Nunn, Xian-Min Jin, W Steven Kolthammer, Marco Barbieri, Bruno Rigal, Patrick S Michelberger, Tessa F M Champion, Philip St J Russell, Ian A Walmsley

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