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arXiv 2401.00519quant-ph
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单激发区基于原子系综量子存储器的多路复用纠缠交换

Multiplexed entanglement swapping with atomic-ensemble-based quantum memories in the single excitation regime

Minjie Wang, Haole Jiao, Jiajin Lu, Wenxin Fan, Shujing Li, Hai Wang

AI总结:

本研究实验演示了基于原子系综量子存储器的多路复用纠缠交换,成功将两个此前未纠缠的存储器投影至纠缠态,并发度C=0.0124,成功概率比非多路复用方案提高三倍。

摘要:

存储器中继链路间的纠缠交换(ES)对于通过量子中继器建立量子网络至关重要。迄今为止,基于原子系综存储器的ES尚未实现。在此,我们通过Duan-Lukin-Cirac-Zoller方案,在两对自旋波存储器纠缠对之间实验演示了ES。将冷原子云置于腔内,我们在12个空间模式中产生了非经典关联的自旋波-光子对,随后通过多路复用方案制备了两对自旋波存储器纠缠对。通过对从两个存储器中读取出的场进行单光子贝尔测量,我们将两个此前从未纠缠的剩余存储器投影至纠缠态,测得的并发度为C = 0.0124(0.003)。与非多路复用方案相比,我们方案中ES的成功概率提高了三倍。我们提出的研究表明,要在剩余的存储器系综之间产生纠缠(C>0),要求自旋波-光子对的平均互相关函数大于30。

英文摘要:

Entanglement swapping (ES) between memory repeater links is critical for establishing quantum networks via quantum repeaters. So far, ES with atomic-ensemble-based memories has not been achieved. Here, we experimentally demonstrated ES between two entangled pairs of spin-wave memories via Duan-Lukin-Cirac-Zoller scheme. With a cloud of cold atoms inserted in a cavity, we produce non-classically-correlated spin-wave-photon pairs in 12 spatial modes and then prepare two entangled pairs of spin-wave memories via a multiplexed scheme. Via single-photon Bell measurement on retrieved fields from two memories, we project the two remaining memories never entangled previously into an entangled state with the measured concurrence of C = 0.0124(0.003). The successful probability of ES in our scheme is increased by three times, compared with that in non-multiplexed scheme. Our presented work shows that the generation of entanglement (C>0) between the remaining memory ensembles requires the average cross-correlation function of the spin-wave-photon pairs to be >30 .

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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