Enhanced energy-constrained quantum communication over bosonic Gaussian channels.,Nature Communications

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Enhanced energy-constrained quantum communication over bosonic Gaussian channels.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-23 , DOI: 10.1038/s41467-020-14329-6
Kyungjoo Noh _{1,

2} , Stefano Pirandola _{3,

4} , Liang Jiang _{1,

2,

5}

Affiliation

Quantum communication is an important branch of quantum information science, promising unconditional security to classical communication and providing the building block of a future large-scale quantum network. Noise in realistic quantum communication channels imposes fundamental limits on the communication rates of various quantum communication tasks. It is therefore crucial to identify or bound the quantum capacities of a quantum channel. Here, we consider Gaussian channels that model energy loss and thermal noise errors in realistic optical and microwave communication channels and study their various quantum capacities in the energy-constrained scenario. We provide improved lower bounds to various energy-constrained quantum capacities of these fundamental channels and show that higher communication rates can be attained than previously believed. Specifically, we show that one can boost the transmission rates of quantum information and private classical information by using a correlated multi-mode thermal state instead of the single-mode thermal state of the same energy.

中文翻译：

通过玻色高斯通道增强能量受限量子通信。

量子通信是量子信息科学的一个重要分支，它为经典通信提供了无条件的安全性，并为未来大规模量子网络提供了基础。现实量子通信信道中的噪声对各种量子通信任务的通信速率施加了根本限制。因此，识别或限制量子通道的量子容量至关重要。在这里，我们考虑对现实光学和微波通信通道中的能量损失和热噪声误差进行建模的高斯通道，并研究它们在能量受限场景中的各种量子容量。我们为这些基本通道的各种能量受限量子容量提供了改进的下限，并表明可以实现比之前认为的更高的通信速率。具体来说，我们表明，通过使用相关的多模热态而不是相同能量的单模热态，可以提高量子信息和私人经典信息的传输速率。

更新日期：2020-01-23

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