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

• Subject Area: Experimental Condensed Matter Physics
• Term: from 2014 to 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 231447078

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.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 142: Tailored nonlinear photonics: From fundamental concepts to functional structures
• Applicant Institution: Universität Paderborn
• Project Heads: Professor Dr. Marc Alexander Aßmann; Professor Dr. Manfred Bayer, until 12/2017; Professor Dr. Stefan Schumacher