Theory of noise suppression in Λ -type quantum memories by means of a cavity

J. Nunn, J. H. D. Munns, S. E. Thomas, Krzysztof T. Kaczmarek, ChangHua Qiu, Amir Feizpour, E Poem, B. Brecht, D. E. J. Saunders, Patrick M. Ledingham, Dileep V. Reddy, M. G. Raymer, I. A. Walmsley

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Quantum memories, capable of storing single photons or other quantum states of light, to be retrieved on demand, offer a route to large-scale quantum information processing with light. A promising class of memories is based on far-off-resonant Raman absorption in ensembles of Λ-type atoms. However, at room temperature these systems exhibit unwanted four-wave mixing, which is prohibitive for applications at the single-photon level. Here, we show how this noise can be suppressed by placing the storage medium inside a moderate-finesse optical cavity, thereby removing the main roadblock hindering this approach to quantum memory.

Original languageEnglish
Article number012338
JournalPhysical Review A
Issue number1
Publication statusPublished - 31 Jul 2017


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Nunn, J., Munns, J. H. D., Thomas, S. E., Kaczmarek, K. T., Qiu, C., Feizpour, A., ... Walmsley, I. A. (2017). Theory of noise suppression in Λ -type quantum memories by means of a cavity. Physical Review A, 96(1), [012338].