Three-qubit Entanglement Properties And Applications

The greatest innovation of physics in the 20th century is the creation of quantum mechanics.Modern physics is based on quantum mechanics and relativity theory.So far,in the field of quantum information related research,the reason why it has made great progress is that it uses quantum mechanics as its basic principle.A large number of theoretical studies have been verified under the existing experimental conditions.The research on the interaction between particles and light fields has always attracted much attention.In this paper,the entanglement factors of three qubit were analyzed and studied by using the method of orthogonalization of coherent states,and the entanglement situation of three qubit in the interaction process of light field in vacuum state was analyzed and studied by using numerical calculation combined with analytical solution.The first chapter of this paper introduces the research progress of quantum communication,the basic knowledge of quantum entanglement,two-body and multi-body entanglement,and several common entangled states.The second chapter introduces the related applications of quantum entanglement in quantum dense coding,quantum secure direct communication and quantum teleportation;and introduces basic quantum logic gates.Chapter third analyzes the relationship of the entanglement of three identical qubits with the frequency of the light field,and the influence of the entanglement of the three qubits under different light field qubit coupling strengths.The quantum entanglement phenomenon under the non-rotating wave approximation is discussed by the coherent state orthogonalization expansion method,and the entanglement dynamics in the three-qubit is discussed by the zero-order approximation method.The research results show that the evolution of the intrinsic energy of the three-qubit with the light field frequency?₀ and time g₀ t is related to the coupling strength,while the evolution of the intrinsic energy of the three-qubit with the time gt has nothing to do with the coupling strength;The evolution of the three-qubit symbiosis entanglement with frequency?₀ and time g₀ t is related to the coupling strength,while the evolution of the three-qubit co-occurrence entanglement with time gt has nothing to do with the coupling strength.Chapter fourth studies the quantum phase gate composed of two two-level atoms coupled with two high-quality superconducting resonators,and analyzes the four implementation methods and specific implementation steps of the Controlled-Z quantum phase gate;and Swap quantum the realization method and concrete realization steps of the phase gate.