摘要
The one-to-multiparty quantum secret sharing scheme [Phys. Rev. A 71 （2005） 044301] proposed recently is extended to a multiparty-to-multiparty case. Furthermore, the continuous variable operations are employed in the extended scheme to replace the specific discrete unitary operations used in the original scheme. The complete randomicity of the continuous variable characterizing the unitary operations can ensure the security of secret sharing. Moreover, the present scheme is compared with the recent similar scheme [Phys. Rev. A 72 （2005） 012304]. It is found that the efficiency of the present scheme is n times of that of the previous one.
The one-to-multiparty quantum secret sharing scheme [Phys. Rev. A 71 （2005） 044301] proposed recently is extended to a multiparty-to-multiparty case. Furthermore, the continuous variable operations are employed in the extended scheme to replace the specific discrete unitary operations used in the original scheme. The complete randomicity of the continuous variable characterizing the unitary operations can ensure the security of secret sharing. Moreover, the present scheme is compared with the recent similar scheme [Phys. Rev. A 72 （2005） 012304]. It is found that the efficiency of the present scheme is n times of that of the previous one.
基金
Supported by the programme for New Century Excellent Talents at the University of China under Grant No NCET-06-0554, the National Natural Science Foundation of China under Grant No 60677001, the Science-Technology Fund of Anhui Province for 0utstanding Youth under Grant No 06042087, the Key Fund of the Ministry of Education of China under Grant No 206063, the Postgraduate Innovation Research Plan from Anhui University under Grant No 20073039, the Natural Science Foundation of Guangdong Province under Grant Nos 06300345 and 7007806, and Natural Science Foundation of Hubei Province under Grant No 2006ABA354.
