1 江西师范大学物理与通信电子学院, 江西 南昌 330022
2 江西省光电子与通信重点实验室, 江西 南昌 330022
应用李雅普诺夫控制理论,对含约瑟夫森结电荷量子比特系统的状态实施了有效调控。 数值仿真表明:对超导电荷量子比特系统,采用基于偏差的李雅普诺夫控制方法,不管是 间接还是直接调控形式,选取适当的控制幅度可以达到对量子系统的调控目的;并 且增大控制幅度,得到的控制函数曲线更平滑,完成控制任务需要的时间越短。这种控制方法 避免了传统控制方法所需要的复杂的迭代计算,可以确保量子系统的稳定。因此,李 雅普诺夫方法是一种具有一定实用意义的调控方法。
量子控制 超导量子比特 李雅普诺夫方法 约瑟夫森结 quantum control superconducting qubits Lyapunov method Josephson junction
Author Affiliations
Abstract
College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 3300222 Key Laboratory of Optoelectronic and Telecommunication of Jiangxi, Nanchang 3300223 Department of Physics, Anqing Teachers College, Anqing 246011
In the Born-Markov approximation and two-level approximation, and using the Bloch-Redfield equation, the decoherence property of superconducting quantum circuit with a flux qubit is investigated. The influence on decoherence of the mutual inductance coupling between the circuit components is complicated. The mutual inductance coupling between different loops will decrease the decoherence time. However, the mutual inductance coupling of the same loop, in a certain interval, will increase the decoherence time. Therefore, we can control the decoherence time by changing the mutual inductance parameters such as the strength and direction of coupling.
磁通量子比特 消相干 玻恩-马尔科夫近似 270.0270 Quantum optics 000.6800 Theoretical physics Chinese Optics Letters
2009, 7(1): 0178
