Quantum dialogue

Nguyen Ba An

Minghui Zhang, Jia-Yao Wu, Jia-Yao Wang

Asymmetry quantum dialogue (AQD) can achieve bidirectional communication between two communicants simultaneously in which both parties can transmit different amounts of message to each other. However, the traditional AQD protocol is available only under the condition that both parties have quantum communication capacities. In this paper, an asymmetry semiquantum dialogue (ASQD) protocol has been proposed. Different form the previous AQD protocols, the proposed ASQD protocol can realize the mutual transmission of secret messages between the classical party and quantum party. Therefore, the ASQD protocol can achieve asymmetry quantum dialogue with fewer quantum resources. Furthermore, the security analysis proves that the ASQD protocol is secure against information leakage problem and eavesdropper's active attacks.

Amber Jenkins

Yan‐Feng Lang, Chengcheng Cai

Abstract Quantum dialogue (QD) is a term of quantum cryptography, which can fulfill the secure exchange of two parties’ private information in an open environment. Up to now, there have been a lot of QD protocols. Many have several common components and activities, such as encoding photons coming forth with auxiliary photons and back, one party or both performing unitary operations on encoding photons, two times of security check, and both parties’ private data being decoded chronologically from encoding photons. This work proposes a brand-new QD model, whose quantum transmission is unidirectional with only one security check and decoding of both parties’ secrets are simultaneous. Equally important is neither unitary operations nor auxiliary photons being used. Consequently, such a QD can substantially reduce costs and increase efficiency, thus entitled fast quantum dialogue (FQD). The presented FQD protocol is analysed with safety and without information leakage. Moreover, its information-theoretical efficiency is 88.89%, much higher than the current maximum 66.67%. So, it offers us a better alternative for QD.

Cristian S. Calude

Anthony J. Killard