Selection of unitary operations in quantum secret sharing without entanglement
【摘要】：We propose a substitute-Bell-state attack strategy for quantum secret sharing schemes without entanglement,as well as a definition of the minimum failure probability of such attack strategy.A quantitative analysis of security degrees corresponding to different unitary operations is also provided,when the secret sharing schemes without entanglement are stricken by substitute-Bell-state attack.As a result,the relation between the selection of unitary operations and the effect of substitute-Bell-state attack is shown,which can serve as an important guidance for the selection of unitary operations in designing and implementing quantum secret sharing schemes.
【基金】：supported by the National Natural Science Foundation of China (Grant No. 60873101) Jiangsu Natural Science Foundation (Grant Nos. BK2007104,BK2008209)