Computable lower bounds on the entanglement cost of quantum channels

Computable lower bounds on the entanglement cost of quantum channels
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量子通道纠缠成本的可计算下限

DOI:
10.1088/1751-8121/aca731
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发表时间:
2023
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
Ludovico Lami and Bartosz Regula
Ludovico Lami and Bartosz Regula
中科院分区:
--
文献类型:
--
作者:
Zhang Guozhu;Zeng Hao;Liu Jiangyang;Nagashima Kazuki;Takahashi Tsunaki;Hosomi Takuro;Tanaka Wataru;Yanagida Takeshi;Ludovico Lami and Bartosz Regula;Ludovico Lami and Bartosz Regula

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最近在Lami和Regula(2023 Nature Physics)中以纠缠单调的形式引入了任何量子态的纠缠成本的一类下界,称为回火鲁棒性和回火负性。在这里,我们将他们的定义扩展到点对点量子信道,建立了任何信道的渐近纠缠成本的下限,无论是有限维还是无限维。特别是,这导致了一个可以作为半定程序计算的边界,并且可以优于先前已知的下限,包括基于量子相对熵的下限。在我们的证明过程中,我们建立了一个有用的链接之间的纠缠量子态的鲁棒性和量子信道,这需要几个技术的发展,如显示较低的连续性的纠缠的鲁棒性的信道在弱 *-算子拓扑上的有界线性映射之间的迹类算子空间。
A class of lower bounds for the entanglement cost of any quantum state was recently introduced in Lami and Regula (2023 Nature Physics) in the form of entanglement monotones known as the tempered robustness and tempered negativity. Here we extend their definitions to point-to-point quantum channels, establishing a lower bound for the asymptotic entanglement cost of any channel, whether finite or infinite dimensional. This leads, in particular, to a bound that is computable as a semidefinite program and that can outperform previously known lower bounds, including ones based on quantum relative entropy. In the course of our proof we establish a useful link between the robustness of entanglement of quantum states and quantum channels, which requires several technical developments such as showing the lower semicontinuity of the robustness of entanglement of a channel in the weak*-operator topology on bounded linear maps between spaces of trace class operators.
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发表时间: 2019-06
影响因子: 8.6
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