Quantum memory with strong and controllable Rydberg-level interactions.
Quantum memory with strong and controllable Rydberg-level interactions.
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DOI：
10.1038/ncomms13618
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发表时间：
2016-11-21
影响因子：
16.6
通讯作者：
Kuzmich, A.
中科院分区：
文献类型：
--
作者：
Li, Lin;Kuzmich, A.
分布式量子系统的实现需要量子态的快速生成和长期存储。基态原子使记忆的存储时间在一分钟的范围内，但是它们相对较弱的相互作用不允许快速创建非经典的集体状态。里德伯原子系统的特点是快速制备单激发态，并有效地将其映射到光中，但这些方法的存储时间尚未超过几微秒。在这里，我们展示了一个结合了快速量子态生成和长期存储的系统。在不到一微秒的时间内，原子存储器的初始准备的相干态通过里德堡能级相互作用转变为非经典的集体原子态。通过将量子态隐藏在基原子水平，存储时间几乎增加了两个数量级。这一进展为可扩展的量子纠缠生成和分布打开了一扇大门。量子信息处理需要量子态的长存储时间，但这通常是以牺牲它们的可寻址性为代价的。在这里，作者开发了一种方法，利用里德伯和原子基态之间的相互作用，报告快速状态生成和长期存储。
Realization of distributed quantum systems requires fast generation and long-term storage of quantum states. Ground atomic states enable memories with storage times in the range of a minute, however their relatively weak interactions do not allow fast creation of non-classical collective states. Rydberg atomic systems feature fast preparation of singly excited collective states and their efficient mapping into light, but storage times in these approaches have not yet exceeded a few microseconds. Here we demonstrate a system that combines fast quantum state generation and long-term storage. An initially prepared coherent state of an atomic memory is transformed into a non-classical collective atomic state by Rydberg-level interactions in less than a microsecond. By sheltering the quantum state in the ground atomic levels, the storage time is increased by almost two orders of magnitude. This advance opens a door to a number of quantum protocols for scalable generation and distribution of entanglement. Quantum information processing requires long-storage time of quantum states, but this typically comes at the expense of their addressability. Here the authors developed a method that exploits interaction between Rydberg and ground states of an atom reporting fast state generation and long-term storage.
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