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Effect of weak measurement on entanglement distribution over noisy channels

机译:弱测量对噪声通道上纠缠分布的影响

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摘要

Being able to implement effective entanglement distribution in noisy environments is a key step towards practical quantum communication, and long-term efforts have been made on the development of it. Recently, it has been found that the null-result weak measurement (NRWM) can be used to enhance probabilistically the entanglement of a single copy of amplitude-damped entangled state. This paper investigates remote distributions of bipartite and multipartite entangled states in the amplitudedamping environment by combining NRWMs and entanglement distillation protocols (EDPs). We show that the NRWM has no positive effect on the distribution of bipartite maximally entangled states and multipartite Greenberger-Horne-Zeilinger states, although it is able to increase the amount of entanglement of each source state (noisy entangled state) of EDPs with a certain probability. However, we find that the NRWM would contribute to remote distributions of multipartite W states. We demonstrate that the NRWM can not only reduce the fidelity thresholds for distillability of decohered W states, but also raise the distillation efficiencies of W states. Our results suggest a new idea for quantifying the ability of a local filtering operation in protecting entanglement from decoherence.
机译:能够在嘈杂的环境中实现有效的纠缠分布是迈向实用量子通信的关键一步,并且在其发展方面已经进行了长期的努力。最近,发现零结果弱测量(NRWM)可用于从概率上增强振幅阻尼纠缠态的单个副本的纠缠。本文通过结合NRWM和纠缠蒸馏协议(EDP),研究了振幅阻尼环境中二分和多分纠缠态的远程分布。我们表明,尽管NRWM能够在一定条件下增加EDP的每个源态(有噪声的纠缠态)的纠缠量,但它对两部分最大纠缠态和Greenberger-Horne-Zeilinger的多态分布没有积极影响。可能性。但是,我们发现NRWM将有助于W多态国家的远程分布。我们证明,NRWM不仅可以降低解耦W态可蒸馏性的保真度阈值,而且还可以提高W态的蒸馏效率。我们的结果提出了一种新的思路,用于量化局部滤波操作在保护纠缠中防止退相干的能力。

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