https://doi.org/10.1140/epjp/i2014-14150-y
Regular Article
Quantum Google algorithm
Construction and application to complex networks
1
Departamento de Física Teórica I, Universidad Complutense, 28040, Madrid, Spain
2
Departament de Matemàtica Aplicada IV, Universitat Politècnica de Catalunya, 08034, Barcelona, Spain
* e-mail: gpaparo@ucm.es
Received:
30
April
2014
Accepted:
10
June
2014
Published online:
22
July
2014
We review the main findings on the ranking capabilities of the recently proposed Quantum PageRank algorithm (G.D. Paparo et al., Sci. Rep. 2, 444 (2012) and G.D. Paparo et al., Sci. Rep. 3, 2773 (2013)) applied to large complex networks. The algorithm has been shown to identify unambiguously the underlying topology of the network and to be capable of clearly highlighting the structure of secondary hubs of networks. Furthermore, it can resolve the degeneracy in importance of the low-lying part of the list of rankings. Examples of applications include real-world instances from the WWW, which typically display a scale-free network structure and models of hierarchical networks. The quantum algorithm has been shown to display an increased stability with respect to a variation of the damping parameter, present in the Google algorithm, and a more clearly pronounced power-law behaviour in the distribution of importance among the nodes, as compared to the classical algorithm.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2014