Clarendon Laboratory, University of Oxford, Oxford, United Kingdom.
Phys Rev Lett. 2011 Jul 29;107(5):053603. doi: 10.1103/PhysRevLett.107.053603. Epub 2011 Jul 25.
Room-temperature, easy-to-operate quantum memories are essential building blocks for future long distance quantum information networks operating on an intercontinental scale, because devices like quantum repeaters, based on quantum memories, will have to be deployed in potentially remote, inaccessible locations. Here we demonstrate controllable, broadband and efficient storage and retrieval of weak coherent light pulses at the single-photon level in warm atomic cesium vapor using the robust far off-resonant Raman memory scheme. We show that the unconditional noise floor of this technically simple quantum memory is low enough to operate in the quantum regime, even in a room-temperature environment.
室温、易于操作的量子存储器是未来洲际量子信息网络的重要组成部分，因为基于量子存储器的量子中继器等设备将不得不部署在潜在的远程、难以到达的位置。在这里，我们使用稳健的远非共振拉曼记忆方案，在温暖的铯原子蒸汽中演示了在单光子水平上对弱相干光脉冲的可控、宽带和高效存储和检索。我们表明，这种技术简单的量子存储器的无条件噪声底足够低，可以在量子 regime 中运行，即使在室温环境下也是如此。
