Quantum Signature Based On Quantum Entanglement State

Quantum information is a new crossing subject of quantum physics and information, which is one of the most advanced theories of information. Digital signatures are base of identity authentication, data integrity and protection of non-repudiation service. At the same time they are important tool in e-commerce and the electronic contract. So they are very important roles in modern digital signature system.The main purpose of this paper is dedicated to weak the arbitration, improve the communication capacity and discuss the question of quantum cryptography, quantum information even quantum mechanics.For weaking the arbitration, two kinds of situations are mainly discussed. The one is that arbitration turned to verification supervisor from the controller. In the process of preparation, signature even verification the work is mainly completed by both of communication sides. The arbitration inspects Bob in the final verification. After the confirmation the original documents are saved by arbitration in order to avoid disputes. The other is that arbitration distributes the message and builds quantum channel. The messages are sent to arbitration, then the arbitration gives the message to the side to sign, finally the feedback information is confirmed by arbitration. Therefore the original documents and identity information is firstly confirmed by arbitration to prevent disputes, especially tampering.Because of quantum properties the communication is safer than before, but the fault is more vulnerable to interfere. In a later section the 4-dimensional particles entanglement is used to improve the efficiency of the single communication.