Compact continuous-variable entanglement distillation.
Compact continuous-variable entanglement distillation.
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紧凑型连续可变纠缠蒸馏。
DOI：
10.1103/physrevlett.108.060502
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发表时间：
2012
影响因子：
8.6
通讯作者：
Datta A
中科院分区：
文献类型：
--
作者：
Datta A
我们介绍了一种新的连续变量纠缠蒸馏方案，它只需要线性的时间和恒定的物理或空间资源。蒸馏是在不可避免地存在退相干的情况下，在网络的远节点之间分布高质量纠缠的过程。该协议的已知版本在空间上呈指数级扩展，在时间上呈双指数级扩展。因此，我们的最优方案比现有协议提供了指数级的改进。它使用一个固定资源模块——一个纠缠蒸馏器——只包含四个量子存储器，存储效率最多为50%，并允许一个可行的实验实现。通过使用现有的非谐振拉曼量子存储器，可以获得实际的量子优势。
We introduce a new scheme for continuous-variable entanglement distillation that requires only linear temporal and constant physical or spatial resources. Distillation is the process by which high-quality entanglement may be distributed between distant nodes of a network in the unavoidable presence of decoherence. The known versions of this protocol scale exponentially in space and doubly exponentially in time. Our optimal scheme therefore provides exponential improvements over existing protocols. It uses a fixed-resource module—an entanglement distillery—comprising only four quantum memories of at most 50% storage efficiency and allowing a feasible experimental implementation. Tangible quantum advantages are obtainable by using existing off-resonant Raman quantum memories outside their conventional role of storage.