关键词: 量子光学, 量子确定性密钥分发, W态, 量子相干, 分发效率, 鲁棒性

Abstract: A quantum deterministic key distribution protocol based on W states was proposed, by using W states as a carrier which suitable for quantum channel transmission. Under the precondition of photon stability, using quantum correlations and a public string S as a key to key distribution, a high efficiency of 54.54% was reached just almost with GHZ states, and photons was transmitted with a stronger robustness. Security analysis results show that this protocol could resist two common attacks, ensures the communication safe and reliable. Meanwhile, this protocol doesn’t involve any unitary operation, it’s simple and easy.

Key words: quantum optics, QDKD, W state, quantum correlations, distribution efficiency, robustness