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Chinese Physics Letters

A Flexible Improvement for Ping-Pong Protocol

刘玉, 华沙, 王晓鑫, 李玥, 叶俊, 李俊

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

一个确定的量通讯协议，叫了 ping-pongprotocol，被 Bostrom 和 Felbinger 代表了[Phys。加快。Lett。89 (2002 ) 187902 ] 。基于光子的纠缠的对，它允许 asymptotically 安全的关键分发和 quasi-securedirect 通讯。然而，这个协议的实验实现要求为 interferometry 严格地相等的二条眼的路径，这从我们的以前的研究被结束。Herewe 建议一个改进协议，它为想得到的应用更灵活、安全。Itsfeasibility 和安全也被讨论。

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一个确定的量通讯协议，叫了 ping-pongprotocol，被 Bostrom 和 Felbinger 代表了[Phys。加快。Lett。89 (2002 ) 187902 ] 。基于光子的纠缠的对，它允许 asymptotically 安全的关键分发和 quasi-securedirect 通讯。然而，这个协议的实验实现要求为 interferometry 严格地相等的二条眼的路径，这从我们的以前的研究被结束。Herewe 建议一个改进协议，它为想得到的应用更灵活、安全。Itsfeasibility 和安全也被讨论。
Квазибаллистический квантовый интерферометр, Быков А.А., Квон З.Д., Ольшанский Е.Б., Асеев А.Л., Бакланов М.Р., Литвин Л.В., Настаушев Ю.В., Мансуров В.Г., Мигаль В.П., Мощенко С.П.
A deterministic quantum communication protocol, called the ping-pong protocol, has been represented by Boström and Felbinger [Phys. Rev. Lett. 89 (2002) 187902]. Based on an entangled pair of photons, it allows asymptotically secure key distribution and quasi-secure direct communication. However, it was concluded from our previous research that the experiment realization of this protocol requires two optic paths strictly equivalent for interferometry. Here we propose an improved protocol, which is more flexible and secure for conceivable applications. Its feasibility and security are also discussed.
Security of the "ping-pong" quantum communication protocol recently proposed by Boström and Felbinger [Phys. Rev. Lett. 89, 187902 (2002)]] is analyzed in the case of considerable quantum channel losses. The eavesdropping scheme is presented, which reveals that the ping-pong protocol is not secure for transmission efficiencies lower than 60%. Our scheme induces 50% losses, which, however, can be hidden in the channel losses if one replaces the original lossy channel with a less lossy one. Finally, a possible improvement of the ping-pong protocol security is proposed.