论文标题
在超导谐振器的无KERR无位点附近的解决方案
Resolving Fock states near the Kerr-free point of a superconducting resonator
论文作者
论文摘要
我们设计了一个可调的非线性谐振器，该谐振器是由蜗牛终止的（超导非线性不对称电感元件）。这样的设备具有最佳位置，其中外部磁通量可以抑制Kerr相互作用。我们在这个无KERR点附近激发了光子，并使用Transmon Qubit表征了该设备。值的激发光谱允许观察到光子数依赖性频率移动的频率比量子线宽大约九倍。我们的研究展示了一个紧凑的集成平台，用于连续变化的量子处理，该平台结合了大型耦合，相当大的松弛时间和对微波域中光子模式结构的良好控制。
We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Nonlinear Asymmetric Inductive eLement). Such a device possesses a sweet spot in which the external magnetic flux allows to suppress the Kerr interaction. We have excited photons near this Kerr-free point and characterized the device using a transmon qubit. The excitation spectrum of the qubit allows to observe photon-number-dependent frequency shifts about nine times larger than the qubit linewidth. Our study demonstrates a compact integrated platform for continuous-variable quantum processing that combines large couplings, considerable relaxation times and excellent control over the photon mode structure in the microwave domain.
