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Coherent Quantum Control in Superconducting Josephson Qubits

Author: ChenJinDan
Tutor: WangBoGen；YuYang
School: Nanjing University
Course: Condensed Matter Physics
Keywords: Superconducting Josephson junction Phase qubit Two-level system Free cross Coherent dynamics Landau-Zener transition Landau-Zener-stückelber interference Rabi oscillation RF superconducting quantum coherent instrument Flux quantum bits
CLC: O413
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


This paper reports a recently established two theoretical work on an experimental basis . About how to use a triangle wave pulse control more than one cross - free system state . Another about how to use the radio frequency superconducting quantum interference device (rf SQUID) to improve the resolution of the magnetometer in the Rabi oscillation in the first chapter , we propose a unified physical model of a research Free cross- system . It can be used to study the dynamic behavior of multi- free cross- system driven single substantially triangular wave . Our approach can be explained recently reported in a three-body system , the interference pattern of the Landau-Zener-Stiickelberg [Nature Communications 1:51 (2010)]. We specialize in studying the impact of the size of the free cross interference , and compare the results of the calculation of the resulting interference pattern and numerical simulation . In addition , the Fourier transform of the interference pattern can be given the energy level structure of the information . In the second chapter , we have designed a macroscopic quantum coherence magnetometer referred to as MAQCOM . It superconducting quantum circuit of macroscopic quantum coherence based . Can be seen as an artificial two-level quantum system . We use the light level transition to detect the magnetic field . Flux resolution experimental device level , this program can reach 2.5μΦ0, is 100 times less damping DC superconducting magnetic field interferometer . Its small size , high resolution it has great application prospects in measurement of quantum nanodevices .

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