The Rapid Implementation Of Distributed Quantum Entanglement,State Transfer And Geometric Quantum Computing

Quantum entanglement,quantum state transfer and geometric quantum computing play a very important role in quantum information processing,and are widely used to deal with various quantum information tasks.Therefore,it is particularly important to choose a good method to realize quantum state transfer,preparation of quantum entangled states and geometric quantum computing.Adiabatic evolution method is a method with strong robustness to the fluctuation of experimental parameters.Because the adiabatic evolution process is very slow,we need to use adiabatic shortcut technology to accelerate adiabatic evolution.In addition,the single cycle evolution method is also a very good method.Some parameters can be set to make the system cycle evolution to eliminate the dynamic phase,so as to obtain the pure geometric phase.This method can not meet the adiabatic condition,so it has a fast evolution speed.The research contents based on adiabatic shortcut technology and single cycle evolution method are briefly summarized as follows:(1)In the coupled cavity system,the state transfer and entangled states are achieved rapidly by means of the decorated state method and laser detuning with atomic energy level.In the scheme,two atoms are bound in two coupled optical cavities.After selecting appropriate parameters,the fidelity and feasibility of the scheme are discussed by numerical simulation.(2)In the cavity fiber cavity system,the scheme of state transfer and entangled state preparation is realized quickly by means of the decorated state method and laser resonating with atomic energy level.In the scheme,two atoms are bound in two optical cavities connected by optical fibres.After selecting appropriate parameters,the fidelity and feasibility of the scheme are discussed by numerical simulation.Through numerical simulation,it can be known that the schemes(1)and(2)are robust to parameter deviation,atomic spontaneous emission,photon leakage and decoherence of cavity fiber cavity system.(3)Using the single cycle evolution method,a scheme of geometrical quantum computation for two separated atoms is proposed.In the scheme,the separated atoms are imprisoned in two directly coupled optical cavities.After selecting appropriate parameters,the feasibility of the scheme and its robustness to some parameter fluctuation and dissipation are proved by numerical simulation.