论文标题
超导体码头汉密尔顿近似对量子状态进化和控制的效果
Superconductor Qubits Hamiltonian Approximations Effect on Quantum State Evolution and Control
论文作者
论文摘要
在没有外部驱动器的情况下，有史以来，在Bloch球上的量子状态，用于超导电荷矩形，相位值和磁通量置量。通过驱动量子位，电荷和通量哈密顿量的近似导致围绕轴的Bloch球的量子状态旋转与精确哈密顿量的旋转载体完全不同。对于近似和精确的哈密顿量的相位值的量子状态的轨迹是相同的，但是对量子可观察到的期望与其他两个量子位相当。微波驱动器控制设计用于近似哈密顿量，并在实际系统上施加，并且相对于所需的轨迹显示完全不同的轨迹。最后，具有外部$μ$ V电压控制和NA电流控制的非线性控制设计用于通用量子，该量子完全稳定量子状态，向所需状态稳定。
Quantum state on Bloch sphere for superconducting charge qubit, phase qubit and flux qubit for all time in absence of external drive is stable to initial state. By driving the qubits, approximation of charge and flux Hamiltonian lead to quantum state rotation in Bloch sphere around an axis completely differ from rotation vector of exact Hamiltonian. The trajectory of quantum state for phase qubit for approximated and exact Hamiltonian is the same but the expectation of quantum observable has considerable errors as two other qubits. microwave drive control is designed for approximated Hamiltonian and exerted on actual systems and shows completely different trajectory with respect to desired trajectory. Finally a nonlinear control with external $μ$V voltage control and nA current control is designed for general qubit which completely stabilizes quantum state toward a desired state.
