量子密集编码的安全性分析

Quantum information is an interdisciplinary research field combining classical information theory and quantum mechanics. It has been shown a broad prospect of scientific and technological applications. Besides the designing of the protocol, the security analysis is also of great importance in quantum cryptography. we analyze the security of the quantum dense coding protocol in arbitrary d-dimensional space against pauli cloning attacks. Through introducing an auxiliary qubit, we clone the transmitted quantum state by Pauli cloning machine to attack on the scheme. Then the security of the scheme is proved by calculating the fidelity and mutual information of the scheme under this attack.