Operational approach to open dynamics and quantifying initial correlations

摘要: A central aim of physics is to describe the dynamics physical systems. Schrodinger's equation does this for isolated quantum Describing time evolution a system that interacts with its environment, in most general form, has proved be difficult because dependent on state environment and correlations it. For discrete processes, such as gates or chemical reactions, process tomography provides complete description dynamics, provided initial states are independent each other. However, many systems correlated at beginning experiment. Here, we give prescription yields even when present. Surprisingly, our method also gives quantitative expressions correlation.