Research On Noise Analysis In Quantum Key Distribution

Quantum communication is one of the most important branches of quantum information, which is the combination of quantum mechanics and information theory. Different from the theory of classical information, the carriers in quantum information are microscopic particles. As a consequence, the work of quantum information is of entirely difference from classical information area, and also has a completely diverse characteristic. Due to the quantum mechanics proved the unconditional security, quantum information has received extensive attention and been vigorously developing. In this paper, we discuss the following issues:the correctness of teleportation scheme when the particles have identical characteristics. And we propose a new quantum circuit model of common quantum key distribution protocol designs. Taking real communication environment under different noise channels into consideration, we get simulations results.A usual scheme of teleportation has defined the system distinguishable by default while teleportation for an indistinguishable particle system is more difficult. Comparing with the usual scheme of teleportation in the distinguishable-particle-system, we propose a scheme for teleporting indistinguishable-particle-system like boson or fermion by adding the spatial degrees of freedom which are various directions of the momentum of three parties before we start the teleportation.We analyze the security of quantum key distribution protocol in the non-ideal circumstances. A new quantum circuit model of quantum key distribution protocol is raised to design simulation models under different noise channel models using the QCircuit. We introduce two indicators of BER and Rsec, and then the circuit models are designed to simulate and analyze the effectiveness and security of quantum key distribution protocol under different noise channel models. The experimental results show the new circuit design achieves the purpose of key distribution protocol and the design approach is more universal significant. Therefore, it can be used to construct more quantum simulation models of different quantum key distribution protocols.