Abstract
Two-State Vector Formalism (TSVF) including pre- and postselected states is a complete description of a system between two measurements. Consequently TSVF gives a perfect solution to the Mean King problem. In this paper, utilizing the dramatic correlation in the verification, we propose a quantum blind signature scheme based on TSVF. Compared with Wen's scheme, our scheme has 100% efficiency. Our scheme guarantees the unconditional security. Moreover, the proposed scheme, which is easy to implement, can be applied to E-payment system.
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