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.
Michelberger, P.S., Champion, T.F.M., Sprague, M.R., Kaczmarek, K.T., Barbieri, M., Jin, X.M., et al. (2015). Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory. NEW JOURNAL OF PHYSICS, 17(4), 043006 [10.1088/1367-2630/17/4/043006].
Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory
BARBIERI, MARCO;
2015-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.