APS/C. Muschik

Figure 1: (Top) In conventional time evolution of quantum systems, different input states $|ψin〉$ lead to different output states $|ψout〉$ if a unitary operation $U$ is applied. (Bottom) Quantum state preparation by reservoir engineering takes a different approach. If the interaction of the system with a bath is engineered such that $|ψfin〉$ is the unique steady state of the dissipative process, then the system is driven into this state irrespective of the initial state initiating the evolution paths $ρ1$, $ρ2$, etc.