Artículos de revistas
Enhancement of quantum speed limit time due to cooperative effects in multilevel systems
Poggi, Pablo Matías; Lombardo, Fernando Cesar; Wisniacki, Diego Ariel; Enhancement of quantum speed limit time due to cooperative effects in multilevel systems; IOP Publishing; Journal of Physics A: Mathematical and Theoretical; 48; 8-2015; 1-10
Poggi, Pablo Matías
Lombardo, Fernando Cesar
Wisniacki, Diego Ariel
Deriving minimum evolution times is of paramount importance in quantum mechanics. Bounds on the speed of evolution are given by the so called quantum speed limit (QSL). In this work we use quantum optimal control methods to study the QSL for driven many level systems which exhibit local two-level interactions in the form of avoided crossings (ACs). Remarkably, we find that optimal evolution times are proportionally smaller than those pre- dicted by the well-known two-level case, even when the ACs are isolated. We show that the physical mechanism for such enhancement is due to non-trivial cooperative effects between the AC and other levels, which are dynamically induced by the shape of the optimized control field.
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