The Superconducting Qubit And Geometric Phase And Ouantum Work In STA Protocol

Superconducting quantum computation is one of the most promising platforms to build a quan-tum computer.In recent years,impressive progress has been achieved both experimentally and theoretically in superconducting devices.Since I started studying for doctor degree,I began to learn the theory and experimental technology,and have built the experimental hardware and soft-ware platform for superconducing qubit.I focus on the experimental measurement and control technology and the design of superconducing phase qubit and transmon qubit during my studying.Transmon qubit has been widely used due to its excellent coherence performance.This thesis mainly includes the following parts:1.We briefly introduce the development of quantum computing and quantum algorithm.The basic concepts of quantum computing are described.We mention several approaches to build a quantum computer.In addition we introduce the history,recent progress of superconducting quan-tum computing.The superconducting quantum computation is moving towards high quality and more qubits.2.We introduce the basic theory of superconducing quantum computation,and the basic idea of circuit quantization.We analyze the circuits QED system,especially the behavior in the dis-persive regime of Jaynes-Cumming model.By analyzing the circuits Hamiltonian,We describe the energy level structure,microwave driving,readout and coupling scheme of transmon qubit.In addition,the relationship between the coherence performance of transmon qubit and the circuit parameters,circuits structure.is illustrated.Finally,we explain the basic idea of designing the superconducing devices.3.We illustrate the experimental platform for superconducting qubit from three aspects:cryo-genic hardware,room temperature hardware and control software.The cryogenic hardware con-tains the dilution refrigerator and the setup for cryogenic wiring.In combination with the factors affecting transmon coherence,control and readout method,the cryogenic wiring is analyzed in detail and our configuration of wiring system is presented.Based on the control requirement of transmon and current microwave technology,we build up room temperature hardware equipment.We create an scalable software system for experimental platform of superconducting quantum com-puting based on LabRAD system.4.We introduce the basic parameter measurement and calibration procedure of xmon qubit.These parameters include the frequency of the readout cavity,the Q-factor,the resonant frequency of qubit,the coherence parameters of qubit and the coupling parameters for the qubit and the readout cavity.The theory and the methods in the calibration procedure are described.5.We measure the Berry phase in the superconducting phase qubit by a shortcut-to-adiabaticity(STA)method.We experimentally verify the evolution trajectory during a STA protocol.Two types of classic noise are introduced to study the noise effect of the Berry phase both theoretically and experimentally.6.We study the statistic of the quantum work in a STA protocol in a superconducting xmon qubit.And we demonstrate the experimental verification of the STA work theory.The main innovations of this thesis are:1.Based on the analysis of the coherence and control requirement of the transmon qubit,we design and build the experimental measurement and control hardware and software for supercon-ducting qubit.2.We first report the measurement of the Berry phase in the superconducting phase qubit by a shortcut-to-adiabaticity method.And we study the noise effect of the Berry phase both theoretically and experimentally.3.We study the statistic of the STA work in a superconducting xmon qubit,and experimentally verify the STA work theory.