Control by quantum dynamics on graphs.
PHYS REV A
, Article 052316. 10.1103/PhysRevA.81.052316.
We address the study of controllability of a closed quantum system whose dynamical Lie algebra is generated by adjacency matrices of graphs. We characterize a large family of graphs that renders a system controllable. The key property is a graph-theoretic feature consisting of a particularly disordered cycle structure. Disregarding efficiency of control functions, but choosing subfamilies of sparse graphs, the results translate into continuous-time quantum walks for universal computation.
|Title:||Control by quantum dynamics on graphs|
|Keywords:||ALGORITHMS, UNIVERSAL, WALKS|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
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