无序电路QED中Toffoli门的分析
Analyzing the Toffoli gate in disordered circuit QED
摘要：
本文研究了量子控制方法在电路QED装置中实现的Toffoli门的非理想性对保真度的影响。在量子比特间的相互作用中引入了噪声。耦合常数不再是固定的;相反，它们围绕平均值波动，服从一些给定的概率密度函数，表征动态不完善的情况。我们还考虑了静态缺陷的情况下，其中的耦合常数的值是不完全已知的。我们得到一个更强大的门，通过修改量子优化问题，使用耦合值的区间上的保真度的加权平均值作为目标函数。
英文摘要：
We study the effects of imperfections on the fidelity of the Toffoli gate recently realized in a circuit~QED setup using quantum control methods. The noise is introduced in the interqubits interactions. The coupling constants are no longer fixed; instead, they fluctuate around average values obeying some given probability density functions characterizing the dynamical-imperfection case. We also consider the static-imperfection case in which the values of the coupling constants are not exactly known. We obtain a more robust gate by modifying the quantum optimization problem using a weighted average of the fidelity over an interval of coupling values as the objective functional.
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