Abstract
In this paper, a quantum payment protocol based on a special set of local indistinguishable orthogonal product states (X-LIOP) is proposed. In the presented protocol, the purchase information is encoded as a sequence of X-LIOP states. With our security analysis, it can be seen that our protocol satisfies the requirements of blindness, unforgeability and undeniability. Specially, the blindness means the purchase information is only known to the buyer and the seller, while the others (including the bank) cannot obtain the purchase information by any means. Once the buyer and seller wants to forge or deny information, they will be found by a trusted third party. Furthermore, since the non-entangled states are applied in our protocol, the protocol can be easily implemented in practice.
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