Context. Occultation experiments represent unique opportunities to remotely probe the physical properties of atmospheres. The data processing involved in modeling time and frequency transfers an electromagnetic signal requires that refractivity be properly accounted for. On theoretical grounds, little work has been done concerning elaboration a covariant approach for occultation data. Aims. We ...

Abstract In this paper we investigate properties of continuous time chiral quantum walks, which possess complex valued edge weights in the underlying graph structure, together with an initial Gaussian wavefunction spread over a number vertices. We demonstrate that, for certain topology and phase matching conditions, are able to direct flow probability amplitudes specific direction inside networ...

We introduce the concept of group state transfer on graphs, summarize its relationship to other concepts in theory quantum walks, set up a basic theory, and discuss examples. Let X be graph with adjacency matrix A consider walks vertex V(X) governed by continuous time-dependent unitary transition operator U(t)=exp(itA). For S,T⊆V(X), we say admits “group transfer” from S T at time τ if submatri...