Raman quantum memory with built-in suppression of four-wave-mixing noise

  title={Raman quantum memory with built-in suppression of four-wave-mixing noise},
  author={Sarah E. Thomas and T. M. Hird and Joseph H. D. Munns and B. Brecht and Dylan J Saunders and Joshua Nunn and Ian A. Walmsley and Patrick M. Ledingham},
  journal={Physical Review A},
Quantum memories are essential for large-scale quantum information networks. Along with high efficiency, storage lifetime, and optical bandwidth, it is critical that the memory adds negligible noise to the recalled signal. A common source of noise in optical quantum memories is spontaneous four-wave mixing. We develop and implement a technically simple scheme to suppress this noise mechanism by means of quantum interference. Using this scheme with a Raman memory in warm atomic vapor, we… 

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