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Chinese Physics Letters

Quantum Secure Direct Communication Network with Two-Step Protocol

李熙涵, 周萍, 梁玉洁, 李 春艶, 周宏余, Fu‐Guo Deng

Published Jan 1, 2006• 1 citation
OpenAlex

Abstract

有效的量有 thetwo 步计划的安全直接通讯网络协议被使用 Einstein-Podolsky-Rosen (EPR ) 建议作为量信息搬运人配对块。服务者，说艾莉斯，在通讯和用户执行的量准备并且测量 EPR 对编码他们的消息的四本地单一的操作。合法用户的任何人能安全地在网络上传达另一一个。自从几乎所有，在这的例子，计划是有用的，每 EPR 对能带二位信息，为 qubits 的效率和两个接近的来源能力最大的价值。

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有效的量有 thetwo 步计划的安全直接通讯网络协议被使用 Einstein-Podolsky-Rosen (EPR ) 建议作为量信息搬运人配对块。服务者，说艾莉斯，在通讯和用户执行的量准备并且测量 EPR 对编码他们的消息的四本地单一的操作。合法用户的任何人能安全地在网络上传达另一一个。自从几乎所有，在这的例子，计划是有用的，每 EPR 对能带二位信息，为 qubits 的效率和两个接近的来源能力最大的价值。
An efficient quantum secure direct communication network protocol with the two-step scheme is proposed by using the Einstein–Podolsky–Rosen (EPR) pair block as the quantum information carrier. The server, say Alice, prepares and measures the EPR pairs in the quantum communication and the users perform the four local unitary operations to encode their message. Anyone of the legitimate users can communicate another one on the network securely. Since almost all of the instances in this scheme are useful and each EPR pair can carry two bits of information, the efficiency for qubits and the source capacity both approach the maximal values.
摘要: 为了提高量子安全直接通信协议的安全性并同时降低其成本，该文通过对协议中检测窃听过程的分析给出了一种有效的方法，并从量子安全直接通信和量子秘密共享两种角度验证了这种方法的可行性。合法通信者使用携带有秘密消息的传输粒子检测窃听，并且不会泄露任何秘密消息。分析表明，合法通信者在不用制备单独用来检测窃听的检测粒子情况下，不仅能够让协议的量子比特理论效率达到100%，而且可以确保其无条件安全。 关键词: 量子安全直接通信 / 传输粒子 / 检测粒子 / 量子比特理论效率
Quantum secure direct communication (QSDC) is a method of communication that transmits secret information directly through a quantum channel. This paper proposes a two-step QSDC scheme based on intermediate-basis, in which the intermediate-basis Einstein–Podolsky–Rosen (EPR) pairs can assist to detect channel security and help encode information. Specifically, the intermediate-basis EPR pairs reduce the probability of Eve choosing the correct measurement basis in the first step, enhancing the security of the system. Moreover, they encode information together with information EPR pairs to improve the transmission efficiency in the second step. We consider the security of the protocol under coherent attack when Eve takes different dimensions of the auxiliary system. The simulation results show that intermediate-basis EPR pairs can lower the upper limit of the amount of information that Eve can steal in both attack scenarios. Therefore, the proposed protocol can ensure that the legitimate parties get more confidential information and improve the transmission efficiency.
We presen a secure direct communication protocol by using step-split Einstein-Podolsky-Rosen (EPR) pair. In this communication protocol, Alice first sends one qubit of an EPR pair to Bob. Bob sends a receipt signal to Alice through public channel when he receives Alice's first qubit. Alice performs her encoding operations on the second qubit and sends this qubit to Bob. Bob performs a Bell-basis measurement to draw Alice's information. The security of this protocol is based on `High fidelity implies low entropy'. If Eve want to eavesdrop Alice's information, she has to attack both qubits of the EPR pair, which results in that any effective eavesdropping attack can be detected. Bob's receipt signal can protect this protocol against the eavesdropping hiding in the quantum channel losses. And this protocol is strictly secure to perform a quantum key distribution by using Calderbank-Shor-Steane codes.