Nonlinear quantum process tomography and photonics of microcavity polaritons (A04)

在这个项目中，我们着手实现涉及微腔极化的非线性量子过程的完整描述。这样的描述是由一个过程矩阵给出的，该过程矩阵将提供给系统的每个可能的输入状态映射到相应的输出状态。为了构建这个矩阵，我们将结合先进的光谱技术和理论建模来实现非线性量子过程断层扫描-一种已知的量子光学技术-并将其应用于半导体系统带来的具体挑战。详细地，我们将充分表征自发的极化子凝聚形成、涡旋形成和极化子光学参量振荡器。

In this project, we set out to realize a complete description of nonlinear quantum processes involving microcavity polaritons. Such a description is given by a process matrix that maps every possible input state fed to the system to its corresponding output state. To construct this matrix, we will combine advanced spectroscopic techniques and theoretical modelling to realize nonlinear quantum process tomography – a technique known from quantum optics – and apply it to the specific challenges posed by semiconductor systems. In detail, we will fully characterize spontaneous polariton condensate formation, vortex formation, and the polariton optical parametric oscillator.