Two-dimensional quantum walk under artificial magnetic field

Yalçınkaya, İskender and Gedik, Zafer (2015) Two-dimensional quantum walk under artificial magnetic field. Physical Review A, 92 (4). ISSN 1050-2947 (Print) 1094-1622 (Online)

[img]PDF (This is a RoMEO green journal -- author can archive publisher's version/PDF) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader

Official URL: http://dx.doi.org/10.1103/PhysRevA.92.042324


We introduce the Peierls substitution to a two-dimensional discrete-time quantum walk on a square lattice to examine the spreading dynamics and the coin-position entanglement in the presence of an artificial gauge field. We use the ratio of the magnetic flux through the unit cell to the flux quantum as a control parameter. For a given flux ratio,we obtain faster spreading for a small number of steps and thewalker tends to be highly localized around the origin. Moreover, the spreading of the walk can be suppressed and decreased within a limited time interval for specific rational values of flux ratio. When the flux ratio is an irrational number, even for a large number of steps, the spreading exhibits diffusive behavior rather than the well-known ballistic one as in the classical random walk and there is a significant probability of finding the walker at the origin. We also analyze the coin-position entanglement and show that the asymptotic behavior vanishes when the flux ratio is different from zero and the coin-position entanglement become nearly maximal in a periodic manner in a long time range.

Item Type:Article
Additional Information:Article Number: 042324
Subjects:Q Science > QC Physics
ID Code:28204
Deposited By:Zafer Gedik
Deposited On:21 Dec 2015 21:09
Last Modified:23 Aug 2019 14:21

Repository Staff Only: item control page