Density matrices and the question of their entanglement have been studied very intensively during the last few years [1]. However the question of how these density matrices arise in the first place has received much less attention. It has been tacitly assumed that density matrices arise when a number of parties, separated in space, start by sharing a pure state, and then this state gets contami...

The Anderson single impurity model, including its Kondo limit, can be seen as the hydrogen atom for correlated systems. Its most striking feature is universal scaling of low-energy properties governed by appearance a emergent scale, temperature ${T}_{K}$. In this work, we demonstrate emergence second independent energy scale in quantum interacting resonant level which equivalent to anisotropic ...