RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan.
Phys Rev Lett. 2011 Jul 22;107(4):043604. doi: 10.1103/PhysRevLett.107.043604.
We study dynamics of a two-level superconducting quantum system, analogous to a natural atom in an open space, by measuring the evolution of its coherent and incoherent emission. The emitted waves containing full information about the states of the artificial atom are efficiently collected due to strong atom-transmission-line coupling. This allows us to do simultaneous measurements of all the quantum state projections and perform a full characterization of the system. We derive coherence times and extract the two-time correlation function from the dynamics of the coherent emission.
我们通过测量其相干和非相干发射的演化来研究类似于开放空间中自然原子的两级超导量子系统的动力学。由于强原子-传输线耦合，包含人工原子状态的完整信息的发射波得到有效收集。这使我们能够同时测量所有量子态投影并对系统进行全面表征。我们从相干发射的动力学中得出相干时间并提取两时间相关函数。
