Design And Fabrication Of Surface Electrode Ions Trap And System Optimization

Ion trap systems have the advantages of long coherence time and high fidelity for quantum computing,quantum simulation,and precise measurement research.In recent years,the scaling up and integration of ion trap systems have been the focus of research.Surface-electrode ion trap is one of the most important platforms for solving this problem but is still in the exploratory stage.The content of this paper is based on the optimization design and fabrication of surface-electrode ion trap to improve the ion trapping perfor-mance and the optimization of the ion trap system.The main contents and innovations are as follows:1.A versatile surface ion trap is designed which contains a loading zone,a manipula-tion zone,and a transportation zone.The radial double wells as the manipulation zone are proposed,which can realize large-scale trapping of ions and rotate the principal axes of ion's motion to reduce the difficulty of effective cooling ions.Independent loading zone can suppress the contamination on manipulation zone in the loading ion process.To shuttle ions between the loading zone and manipulation zone,the V-shaped junction is propsed and optimized by multi-objective function and ant colony algorithm.The versatile surface ion trap will be extensively used in scaling up ion trap systems,simulating spin-spin interaction and sympathetic cooling ions.2.A thick film surface-electrode ion trap with the inverted trapezoidal electrode in cross-section is proposed.In the wet etching process,the galvanic battery effect is flexibly used to extend the length of the electrode gap so that the breakdown voltage of the trap is effectively in-creased from 350V to over 1000V.Compared with the fabrication of multi-layer electrode ion trap,it not only greatly simplifies fabrication but also reduces trap contamination during the fabrication process.improve the quality of the surface electrode ion trap chip.3.The anomalous heating of ions is suppressed,which can prolong the lifetime of trapped ions.By reducing the electrode's surface roughness to reduce the ion heating rate,the trapped ion's lifetime is prolonged by five times.Cleaning surface-electrode ion trap with plasma can prolong lifetime by three times.The heating rate of ions is measured tobe about 0.75(?)/ms.Furthermore,a convenient real-time monitoring method is proposed to characterize the contamination and the cleaning of the trap electrode surface.4.The separation,merger,and shuttling of ions are realized,including using the inverse solution method of electrode voltage and feedback control to suppress stray electric fields.The equal distance ion string and structural phase transition of ionic crystal in the anharmonic trap are realized.In addition,the higher precision central resonance frequency is obtained using the double laser pulse scanning resonance transition spectrum,the testing accuracy of the surface electrode ion trap is improved.The ion trap experiment system is optimized effectively.