Quantum key secure communication protocol via enhanced superdense coding

Yan Xia, He‐Shan Song

Zhihao Liu, Hanwu Chen, Wenjie Liu +3 more

Guillermo B. Morales-Luna

Huang, Da-Zu, Guo Guo +3 more

Zeynep Çelik, Hüseyin Bodur

Abstract The security and anonymity of e-payment transactions are paramount. In this study, we propose a centralised e-payment protocol based on superdense coding. By adopting quantum key establishment principles inspired by quantum key distribution (QKD) and combining them with superdense coding-based message transmission, symmetric key encryption, and two-particle entanglement, our quantum e-payment protocol utilises Bell states to reduce the complexity of quantum resources. The protocol is used for both key distribution and secure message transmission between the communicating parties. It is also resilient against quantum attacks and provides operational non-repudiation and immutability. Compared to previously proposed protocols, our protocol offers improved security while maintaining practical feasibility for real-world applications.

Mario Mastriani

In the last decades, Quantum Cryptography has become one of the most important branches of Quantum Communications with a particular projection over the future Quantum Internet. It is precisely in Quantum Cryptography where two techniques stand out above all others: Quantum Key Distribution (QKD), and Quantum Secure Direct Communication (QSDC). The first one has four loopholes relating to the exposure of the key at all points in the communication system, while the second has clear practical implementation problems in all its variants currently in use. Here, we present an alternative to QKD and QSDC techniques called quantum key secure communication (QKSC) protocol with a successful implementation on two free access quantum platforms.