Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory. (2nd April 2015)

• Record Type: Journal Article
• Authors: Michelberger, P S; Champion, T F M; Sprague, M R; Kaczmarek, K T; Barbieri, M; Jin, X M; England, D G; Kolthammer, W S; Saunders, D J; Nunn, J; Walmsley, I A
• Is Part Of: New journal of physics. Volume 17:Number 4(2015:Apr.)
• Publication Date: 2015-04-02
• Subjects: quantum memory -- single photon storage -- Raman interaction -- room-temperature -- quantum computer -- quantum communication -- temporal multiplexer; 42.50.Ct -- 42.50.Ex -- 03.67.Lx -- 42.65.Hw; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/17/4/043006
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: Broadband quantum memories, used as temporal multiplexers, are a key component in photonic quantum information processing, as they make repeat-until-success strategies scalable. We demonstrate a prototype system, operating on-demand, by interfacing a warm vapour, high time-bandwidth-product Raman memory with a travelling wave spontaneous parametric down-conversion source. We store single photons and observe a clear influence of the input photon statistics on the retrieved light, which we find currently to be limited by noise. We develop a theoretical model that identifies four-wave mixing as the sole important noise source and point towards practical solutions for noise-free operation.