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

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)


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


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