量子ネットワークを安定化するためのブリッジの追加 (Adding bridges to stabilize quantum networks)

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2025-01-23 ノースウェスタン大学

量子ネットワークを安定化するためのブリッジの追加 (Adding bridges to stabilize quantum networks)New strategy potentially could lead to optimally designed quantum networks for lightning-fast computing and ultra-secure communications.

ノースウェスタン大学の研究チームは、量子ネットワークの安定性を向上させるための新しい戦略を発表しました。量子通信ではリンクが一度使用されると消滅する問題があり、ネットワークが徐々に崩壊します。この課題に対し、通信ごとに適切な数のリンク(「橋」)を再接続するモデルを提案しました。その結果、ユーザー数の平方根に比例するリンクを追加することでネットワークの安定性を保てることが判明しました。この研究は、高速計算や安全な通信を支える次世代量子ネットワーク設計の基礎となります。

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量子通信ネットワークにおけるパスパーコレーション Path Percolation in Quantum Communication Networks

Xiangyi Meng, Bingjie Hao, Balázs Ráth, and István A. Kovács
Physical Review Letters Published: 23 January, 2025
DOI:https://doi.org/10.1103/PhysRevLett.134.030803

Abstract

In a quantum communication network, links represent entanglement between qubits located at different nodes. Even if two nodes are not directly linked by shared entanglement, they can still communicate via routing protocols. However, in contrast to classical communication, each quantum communication event removes all participating links along the routed path, disrupting the quantum communication network. Here, we propose a simple model, where randomly selected pairs of nodes communicate through the shortest paths. Each time such a path is used, all participating links are eliminated, leading to a correlated percolation process that we call “path percolation.” We study path percolation both numerically and analytically and present the phase diagram of the steady states as a function of the rate at which new links are being added to the network. As a key result, the steady state is found to be independent of the initial network topologies when new links are added randomly between disconnected components. We close by discussing extensions of path percolation and link replenishment, along with their potential applications.

1600情報工学一般
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