Quantum walks: a comprehensive review

Quantum walks, the quantum mechanical counterpart of classical random walks, is an advanced tool for building quantum algorithms that has been recently shown to constitute a universal model of quantum computation. Quantum walks is now a solid field of research of quantum computation full of exciting open problems for physicists, computer scientists, mathematicians and engineers. In this paper we review theoretical advances on the foundations of both discrete- and continuous-time quantum walks, together with the role that randomness plays in quantum walks, the connections between the mathematical models of coined discrete quantum walks and continuous quantum walks, the quantumness of quantum walks, a summary of papers published on discrete quantum walks and entanglement as well as a succinct review of experimental proposals and realizations of discrete-time quantum walks. Furthermore, we have reviewed several algorithms based on both discrete- and continuous-time quantum walks as well as a most important result: the computational universality of both continuous- and discrete- time quantum walks.Comment: Paper accepted for publication in Quantum Information Processing Journa

A psychology perspective of energy consumption in organisations: The value of participatory interventions

This paper provides a psychology perspective on the human factors that should be taken into consideration when designing behaviour-based energy-saving interventions for non-residential buildings. We review psychological theories used to explain energy-related behaviours and discuss their limitations as well as additional hindrances that interfere with employees' energy conservation. Furthermore, we highlight the features that distinguish residential from non-residential buildings and discuss how these factors may affect peoples' efforts to save energy. In conclusion, we argue that it is ineffective to promote energy-saving behaviours through top-down communication (e.g. information campaigns) but that decision-makers should rather rely on participatory designs, since these facilitate consumers' involvement, increase intrinsic motivation to save energy, take consumers' social environment into account, establish new energy-consumption norms, and encourage overt commitment of individuals to energy savings. Furthermore, we outline how participatory interventions could be strengthened by using motivational interviewing (MI) techniques, a conversation style that could be utilised to evoke users' motivation to engage in energy-conversation behaviours in non-residential buildings. Since basic MI skills can be learned within few days, we recommend that energy managers receive such a training in order to conduct in-house participatory MI-based interventions