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