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- W3102714467 abstract "Quantum memories are an integral component of quantum repeaters - devices that will allow the extension of quantum key distribution to communication ranges beyond that permissible by passive transmission. A quantum memory for this application needs to be highly efficient and have coherence times approaching a millisecond. Here we report on work towards this goal, with the development of a $^{87}$Rb magneto-optical trap with a peak optical depth of 1000 for the D2 $F=2 rightarrow F'=3$ transition using spatial and temporal dark spots. With this purpose-built cold atomic ensemble to implement the gradient echo memory (GEM) scheme. Our data shows a memory efficiency of $80pm 2$% and coherence times up to 195 $mu$s, which is a factor of four greater than previous GEM experiments implemented in warm vapour cells." @default.
- W3102714467 created "2020-11-23" @default.
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- W3102714467 date "2013-08-23" @default.
- W3102714467 modified "2023-10-14" @default.
- W3102714467 title "Gradient echo memory in an ultra-high optical depth cold atomic ensemble" @default.
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- W3102714467 doi "https://doi.org/10.1088/1367-2630/15/8/085027" @default.
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