Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory

P. S. Michelberger, T. F M Champion, M. R. Sprague, K. T. Kaczmarek, M. Barbieri, X. M. Jin, D. G. England, W. S. Kolthammer, D. J. Saunders, J. Nunn, I. A. Walmsley

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79 Citations (SciVal)


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.

Original languageEnglish
Article number043006
JournalNew Journal of Physics
Publication statusPublished - 1 Apr 2015


  • quantum communication
  • quantum computer
  • quantum memory
  • Raman interaction
  • room-temperature
  • single photon storage
  • temporal multiplexer

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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