QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands.
QuTech and Netherlands Organization for Applied Scientific Research (TNO), 2628 CJ Delft, Netherlands.
Phys Rev Lett. 2023 Mar 31;130(13):137001. doi: 10.1103/PhysRevLett.130.137001.
We report observations of transitions between excited states in the Jaynes-Cummings ladder of circuit quantum electrodynamics with electron spins (spin circuit QED). We show that unexplained features in recent experimental work correspond to such transitions and present an input-output framework that includes these effects. In new experiments, we first reproduce previous observations and then reveal both excited-state transitions and multiphoton transitions by increasing the probe power and using two-tone spectroscopy. This ability to probe the Jaynes-Cummings ladder is enabled by improvements in the coupling-to-decoherence ratio, and shows an increase in the maturity of spin circuit QED as an interesting platform for studying quantum phenomena.
我们报告了在电子自旋（自旋电路量子电动力学）的 Jaynes-Cummings 阶梯中观察到的激发态之间的跃迁。我们表明，最近实验工作中的未解释特征对应于这些跃迁，并提出了一个包含这些效应的输入-输出框架。在新的实验中，我们首先复制了以前的观察结果，然后通过增加探针功率和使用双音光谱法，揭示了激发态跃迁和多光子跃迁。这种探测 Jaynes-Cummings 阶梯的能力得益于耦合到退相干比的提高，并且表明自旋电路量子电动力学作为研究量子现象的有趣平台的成熟度有所提高。
