CONTROLLED QUANTUM SECURE DIRECT COMMUNICATION WITH W STATE
Xiu‐Bo Chen, Qiaoyan Wen, Fen-Zhuo Guo, Ying Sun, Gang Xu, Fu-Chen Zhu · International Journal of Quantum Information · 2008
Utilizing W state, which is much more robust than GHZ state, we propose a protocol for three-party controlled quantum secure direct communication (QSDC). The feature of this protocol is that the sender encodes the secret message directly on a sequence of particle states and faithfully transmits them to an arbitrary one of two receivers without revealing any information to a potential eavesdropper. On the other hand, we construct the efficient quantum circuit to implement the QSDC by means of primitive operations in quantum computation.