title: Quantum speed limit for physical processes.
abstract: The evaluation of the minimal evolution time between two distinguishable states of a system is important for assessing the maximal speed of quantum computers and communication channels. Lower bounds for this minimal time have been proposed for unitary dynamics. Here we show that it is possible to extend this concept to nonunitary processes, using an attainable lower bound that is connected to the quantum Fisher information for time estimation. This result is used to delimit the minimal evolution time for typical noisy channels.
authors: Instituto de Física, Universidade Federal do Rio de Janeiro, 21.941-972 Rio de Janeiro (RJ), Brazil. marciotaddei@if.ufrj.br
authors: M M
authors: MM
authors: Taddei
authors: B M
authors: BM
authors: Escher
authors: L
authors: L
authors: Davidovich
authors: R L
authors: RL
authors: de Matos Filho