Quantum Teleportation Key Problems And Its Application Under Noise

Information security is a prerequisite to promoting the development of information technology since cryptosystem is the basis of information security.Traditionally based on complex calculations,the classical cryptographic algorithm has become easier and even "vulnerable" to attacks within the time of super-new technologies such as quantum computing in the post-Modern era.Quantum teleportation is has the unique characteristic of indivisibility,a non-clone state,detection of instantaneous collapse.According to the theory of quantum coherent superposition and quantum entanglement.Quantum teleportation can also measure the quantum state and calculate the particle collapse state,and reconstructs the unknown quantum state information by perform unitary operator.It guarantees the absolute security of information transmission and plays an important role in large-scale quantum computing,it’s long-range quantum communication and quantum computing in networks.Currently it has become the research hotspot of academia,military and information technology.With regards to quantum decoherence growing under noise,the non-localized and non-classical strong correlation of photon’s multi-degree of freedom in quantum physics.This feature is shaken single freedom independence hypothesis in the quantum teleportation protocol,which leads to the problem that the existing quantum teleportation channel is difficult to provide satisfactory system under the contradiction between limited resources and entangled death,and proposes a robust quantum teleportation protocol which is closer to the actual environment.The main research results are as follows:1.Construction of high fidelity entangled quantum teleportation channelFirstly,we describe the "entanglement death" problem and the quantum decoherence phenomenon in the process of quantum teleportation.Therefore,we analysed the evolution of entanglement over time of two independent atomic systems in space,developed a relationship between the with initial entanglement of atoms and cavities,entanglement of cavity field,and then outlined the "entangled death" immune model.By analyzing the oscillatory phenomenon of the decoherence factor in the T-C model and the J-C model,the quantum decoherence entanglement evolution model is described.Secondly,regarding the different noise characteristics,we designed an immune noise model based on the density matrix and joint noise immune model based on DFS,and analyzed the optimal quantum bit efficiency under different roles.Finally,for the problem of low channel capacity,we designed the channel capacity coding based on schema-based Tree and Forest,and effectively calculate the noise volume capacity of the approximation and noise margin.We then obtained the area where the quantum information is transmitted under different noise channels and common local noise.2.Quantum information splitting of Bell state and arbitrary state in different quantum channels.Fewer qubits are transported and is computationally complex in different channels or the same channel.We addressed this challenge by proposing an innovative method of quantum information splitting of Bell state and arbitrary state by using different quantum channels.Firstly,it by using four-qubit entangled state as quantum channel and splitting the two-qubit Bell state,it can transmit a Bell state;Secondly,quantum information splitting of arbitrary single-qubit and two-qubit by using five-qubit entangled state;Finally,using different quantum channels,that means using four-qubit cluster state and Bell state,or using four-qubit cluster state and GHZ state to split arbitrary three-qubit,perform different measurement operations to achieve an efficient quantum information splitting process,and the process of quantum information splitting is physically realized in cavity quantum electrodynamics.3.Multiple degrees of freedom quantum teleportation protocol for immune noiseAccording to the problem of single degree of freedom,quantum teleportation is costly and inefficient.We addressed this challenge by proposing a new immune noise controllable multiple degrees of freedom quantum teleportation protocol.Firstly,we consider the distribution characteristics of multiple degrees of freedom in time,space,frequency in the spin-orbital angular momentum,it achieves the preparation of high-brightness entangled sources at multiple degrees of freedom.Secondly,we described the relationship between the spin-orbit angular momentum and the super Bell state,and performed the measurement of the Bell states and the super-dense coding,which achieves the multiple demand targets for the super Bell state measurement under the constraints of the respective angular momentum.Finally,a controllable quantum teleportation identity authentication model is designed robust quantum teleportation is realized under independent different noise and local common noise,and we then analyzed the fidelity and the average fidelity of the protocol,and improved in measurement efficiency and safety.4.Application of fault tolerant quantum teleportation protocol in noise channelFor the bottleneck problem of quantum teleportation in application,we designed an immune noise of quantum dialogue and quantum key distribution of continuous variables under two typical applications.First,a dialogue mechanism based on decoy and steganography is proposed to detect whether the identity of both parties is correct as well as the security of the dialogue channel.We constructed single photon,generalized entangled state which converts the previously shared identifiers of the conversations to the logical quantum states of the combined noise immunity,and then randomly mixed and implicitly transmitted in the information sequence,both for identity authentication and eavesdropping detection.Secondly,a deterministic quantum key distribution protocol for continuous variables is proposed.Mainly the sender through the public channel transmits a predetermined key to the information receiver.Finally,by using security and performance verification,the two quantum teleportation applications have shown to be highly robust and efficient,with greater potential and fault tolerance under noise.In summary,this thesis focuses on the key problems of quantum teleportation and its application under noise.The research results provide a new solution for the field,enrich the quantum communication theory,and further promote the development of practical quantum teleportation technology.