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arXiv 1909.01006quant-ph
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通信波段原子-光子纠缠的长距离分布

Long-distance distribution of atom-photon entanglement at telecom wavelength

Tim van Leent, Matthias Bock, Robert Garthoff, Kai Redeker, Wei Zhang, Tobias Bauer, Wenjamin Rosenfeld, Christoph Becher, Harald Weinfurter

摘要:

静态量子存储器和光子信道之间的纠缠是未来量子网络的重要资源。与纠缠蒸馏一起,它将使量子态的有效分布成为可能。本文报道了在20 km长的光纤中,Rb-87原子与通信波长光子纠缠的产生和观测。为此,我们使用保偏量子频率转换将与原子自旋态纠缠的光子的波长从780 nm转换到电信S波段1522 nm。我们实现了前所未有的外部设备转换效率为57%,并观察到原子和电信光子之间的纠缠保真度为$\geqslant$ 78.5 $\pm$ 0.9%,超过20 km的光纤,主要由原子态的退相干限制。这一结果是大规模分发量子信息道路上的重要里程碑。

英文摘要:

Entanglement between stationary quantum memories and photonic channels is the essential resource for future quantum networks. Together with entanglement distillation it will enable for efficient distribution of quantum states. Here we report on the generation and observation of entanglement between a Rb-87 atom and a photon at telecom wavelength over 20 km optical fiber. For this purpose, we use polarization-preserving quantum frequency conversion to transform the wavelength of a photon entangled with the atomic spin state from 780 nm to the telecom S-band at 1522 nm. We achieve an unprecedented external device conversion efficiency of 57% and observe an entanglement fidelity between the atom and telecom photon of $\geqslant$78.5$\pm$0.9% over 20 km optical fiber, mainly limited by decoherence of the atomic state. This result is an important milestone on the road to distribute quantum information on a large scale.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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