论文标题
寄生相互作用和微波串扰的作用在两个超导原子的分散控制中
Role of parasitic interactions and microwave crosstalk in dispersive control of two superconducting artificial atoms
论文作者
论文摘要
在这项工作中，我们研究了寄生相互作用和微波串扰的作用，该系统在通过单模共面波导相互作用的两个超导性人工原子的系统中。通过对原子的有效动力学的一般描述，除了两级近似之外，我们表明原子的选择性（能够单独处理原子）仅取决于与控制系统用于控制系统的驱动器相关的结果词。然后，我们利用这种依赖驱动的选择性的好处来描述相干种群反演在原子中的同时发生，而无需干扰残留的原子 - 原子相互作用。在这种情况下，寄生交互作用是快速和高保真控制的资源，因为它为原子能够抑制有效的原子 - 原子耦合（空闲点）的原子带来了新的频率。最后，我们展示了如何实施纠缠$ i $交换门，即使在存在寄生互动的情况下，忠诚度则高于$ 99 \％$。除此之外，我们认为这种交互的存在可能有助于加快栅极性能。我们的结果为这种``不希望的''效应在超导性人工原子系统中的真正作用开辟了新的前景。
In this work we study the role of parasitic interactions and microwave crosstalk in a system of two superconducting artificial atoms interacting via a single-mode coplanar waveguide. Through a general description of the effective dynamics of the atoms, beyond the two-level approximation, we show that the atom selectivity (ability to individually address an atom) is only dependent on the resultant phasor associated to the drives used to control the system. We then exploit the benefits of such a drive-dependent selectivity to describe how the coherent population inversion occurs in the atoms simultaneously, with no interference of residual atom-atom interaction. In this scenario the parasitic interaction works as a resource to fast and high fidelity control, as it gives rise to a new regime of frequencies for the atoms able to suppress effective atom-atom coupling (idling point). To end, we show how an entangling $i$SWAP gate is implemented with fidelity higher than $99\%$, even in presence of parasitic interactions. More than that, we argue that the existence of this interaction can be helpful to speed up the gate performance. Our results open prospects to a new outlook on the real role of such ``undesired" effects in a system of superconducting artificial atoms.
