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By harnessing aspects of quantum mechanics, communication and informationprocessing could be radically transformed. Promising forms of quantuminformation technology include optical quantum cryptographic systems andcomputing using photons for quantum logic operations. As with currentinformation processing systems, some form of memory will be required. Quantumrepeaters, which are required for long distance quantum key distribution,require optical memory as do deterministic logic gates for optical quantumcomputing. In this paper we present results from a coherent optical memorybased on warm rubidium vapour and show 87% efficient recall of light pulses,the highest efficiency measured to date for any coherent optical memory. Wealso show storage recall of up to 20 pulses from our system. These results showthat simple warm atomic vapour systems have clear potential as a platform forquantum memory.

High efficiency coherent optical memory with warm rubidium vapour