论文标题
较高量子的Qubits对控制约瑟夫森量子滤波器保护的量子的影响
Effects of higher levels of qubits on control of qubit protected by a Josephson quantum filter
论文作者
论文摘要
约瑟夫森量子滤波器（JQF）将数据量子量（DQ）从辐射衰减中保护到超导量子计算体系结构中的传输线。 Transmon是一种弱的非线性谐波振荡器，而不是纯的两级系统，可以发挥JQF或DQ的作用。但是，在先前的研究中，将JQF和DQ建模为两级系统，忽略了较高水平的影响。从理论上讲，我们研究了较高的JQF和DQ对DQ控制的影响。结果表明，较高的DQ级别导致共振频率的移位以及DQ在对照中的最大群体的最大种群的减少，而连续波（CW）场和PULSED领域的最大种群，而JQF的较高水平则没有。此外，我们提出了脉冲场的最佳参数，从而最大程度地提高了控制效率。
A Josephson quantum filter (JQF) protects a data qubit (DQ) from the radiative decay into transmission lines in superconducting quantum computing architectures. A transmon, which is a weakly nonlinear harmonic oscillator rather than a pure two-level system, can play a role of a JQF or a DQ. However, in the previous study, a JQF and a DQ were modeled as two-level systems neglecting the effects of higher levels. We theoretically examine the effects of the higher levels of the JQF and the DQ on the control of the DQ. It is shown that the higher levels of the DQ cause the shift of the resonance frequency and the decrease of the maximum population of the first excited state of the DQ in the controls with a continuous wave (cw) field and a pulsed field, while the higher levels of the JQF do not. Moreover, we present optimal parameters of the pulsed field, which maximize the control efficiency.
