Zero forcing, linear and quantum controllability for systems evolving on networks

Details Zero forcing, linear and quantum controllability for systems evolving on networks Zero forcing, linear and quantum controllability for systems evolving on networks

2011-11-07

arxiv.org/abs/1111.1475v1

Physics

Quantum Physics

12 pages, 1 figure

Scientific paper

We study the dynamics of systems on networks from a linear algebraic perspective. The control theoretic concept of controllability describes the set of states that can be reached for these systems. Under appropriate conditions, there is a connection between the quantum (Lie theoretic) property of controllability and the linear systems (Kalman) controllability condition. We investigate how the graph theoretic concept of a zero forcing set impacts the controllability property. In particular, we prove that if a set of vertices is a zero forcing set, the associated dynamical system is controllable. The results open up the possibility of further exploiting the analogy between networks, linear control systems theory, and quantum systems Lie algebraic theory. This study is motivated by several quantum systems currently under study, including continuous quantum walks modeling transport phenomena. Additionally, it proposes zero forcing as a new notion in the analysis of complex networks.

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