High-speed noise-free optical quantum memory
High-speed noise-free optical quantum memory
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DOI：
10.1103/physreva.97.042316
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发表时间：
2018-04-10
影响因子：
2.9
通讯作者：
Walmsley, I. A.
中科院分区：
文献类型：
--
作者：
Kaczmarek, K. T.;Ledingham, P. M.;Walmsley, I. A.
光量子存储器是存储和回忆量子光的设备，对于实现未来的光子量子网络至关重要。迄今为止，已经投入了大量的努力来改善这种设备的存储时间和效率，以实现长距离通信。然而，较少的注意力已经致力于建立量子存储器，增加零噪声的输出。即使是很小的额外噪声也可以通过破坏存储光的脆弱量子特征来使存储器经典化。因此，噪声性能是所有量子存储器的关键参数。本文介绍了一种基于双光子非共振级联吸收（ORCA）的本征无噪声量子存储方案。我们证明了成功的存储GHz带宽预示着单光子在温暖的原子蒸气中没有增加噪音，确认了召回后不变的光子数统计。我们的ORCA存储器满足量子存储器的严格噪声要求，同时将高速和室温操作与技术简单性相结合，因此可立即应用于低延迟量子网络。
Optical quantum memories are devices that store and recall quantum light and are vital to the realization of future photonic quantum networks. To date, much effort has been put into improving storage times and efficiencies of such devices to enable long-distance communications. However, less attention has been devoted to building quantum memories which add zero noise to the output. Even small additional noise can render the memory classical by destroying the fragile quantum signatures of the stored light. Therefore, noise performance is a critical parameter for all quantum memories. Here we introduce an intrinsically noise-free quantum memory protocol based on two-photon off-resonant cascaded absorption (ORCA). We demonstrate successful storage of GHz-bandwidth heralded single photons in a warm atomic vapor with no added noise, confirmed by the unaltered photon-number statistics upon recall. Our ORCA memory meets the stringent noise requirements for quantum memories while combining high-speed and room-temperature operation with technical simplicity, and therefore is immediately applicable to low-latency quantum networks.