Theory of noise suppression in {\Lambda}-type quantum memories by means of a cavity
Abstract
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 -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.
Keywords
Cite
@article{arxiv.1601.00157,
title = {Theory of noise suppression in {\Lambda}-type quantum memories by means of a cavity},
author = {J. Nunn and S. Thomas and J. H. D. Munns and K. T. Kaczmarek and C. Qiu and A. Feizpour and E. Poem and B. Brecht and D. J. Saunders and P. M. Ledingham and Dileep V. Reddy and M. G. Raymer and I. A. Walmsley},
journal= {arXiv preprint arXiv:1601.00157},
year = {2017}
}
Comments
10 pages, 3 figures. This paper provides the theoretical background to our recent experimental demonstration of noise suppression in a cavity-enhanced Raman-type memory ( arXiv:1510.04625 ). See also the related paper arXiv:1511.05448, which describes numerical modelling of an atom-filled cavity. Comments welcome