Trapping a particle of a quantum walk on the line
Antoni Wójcik, Tomasz Łuczak, Paweł Kurzyński, Andrzej Grudka, Tomasz Gdala, Małgorzata Bednarska-Bzdȩga · Physical Review A · 2012
We observe that changing a phase at a single point in a discrete quantum walk results in a rather surprising localization effect. For certain values of this phase change the possibility of localization strongly depends on the internal coin state of the walker.