Quantum optimal control of quantum logical gate in dissipation systems

• Main Authors: Chun-ChiehNi, 倪峻傑
• Other Authors: Chi-Chuan Hwang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/73823303721116138805

碩士 === 國立成功大學 === 工程科學系碩博士班 === 101 === Quantum state fidelity has been widely used to indicate whether simulated quantum gate is close to an ideal one. However, as shown in the thesis, it is not objective enough to show the similarity between real and ideal quantum gates. In order to avoid this shortcoming, we apply quantum process fidelity for designing reliable and faithful quantum logic gates. In this thesis, we design high reliable quantum logic gates in open quantum systems with quantum process tomography. Firstly, we take the ro-vibratoinal states of CO molecule to discuss how the systems were influenced by environment in one qubit quantum open system. Sequentially, the quantum entangling logic gates were simulated in open spin systems, the result also shows that the quantum process fidelities can achieve up to 97%. Finally, we use genetic algorithm to realize NOT and Hadamard quantum logic gates in CO molecule quantum systems and both of quantum process fidelities can be better than 97%. The proposed scheme can provide a basis for design and implementation of quantum computers.