量子通信中纠缠辅助能力的基本限制

IF 8.1 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-01-17 DOI:10.1103/physrevlett.134.020802

Lasse H. Wolff, Paula Belzig, Matthias Christandl, Bergfinnur Durhuus, Marco Tomamichel

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引用次数: 0

摘要

通过预共享纠缠可以提高量子信道上可靠通信的最佳速率。尽管在无限维环境中，即使输入功率受到限制，增强也可能是无界的，但一个长期存在的猜想断言，在有限维环境中，纠缠辅助和非辅助的经典能力之间的比率是有界的[Bennett，]。在这封信中，我们证明了这个猜想，证明了它们的比值的上界是0 (d2)，其中d是通道的输入维数。给出了带噪声的编码器和解码器在量子通信中的应用。2025年由美国物理学会出版

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Fundamental Limit on the Power of Entanglement Assistance in Quantum Communication

The optimal rate of reliable communication over a quantum channel can be enhanced by preshared entanglement. Whereas the enhancement may be unbounded in infinite-dimensional settings even when the input power is constrained, a long-standing conjecture asserts that the ratio between the entanglement-assisted and unassisted classical capacities is bounded in finite-dimensional settings [Bennett , ]. In this Letter, we prove this conjecture by showing that their ratio is upper bounded by o(d2), where d is the input dimension of the channel. An application to quantum communication with noisy encoders and decoders is given.

Published by the American Physical Society

2025

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks