Robust quantum state engineering through coherent localization in biased-coin quantum walks

Robust quantum state engineering through coherent localization in biased-coin quantum walks

Abstract We address the performance of a coin-biased quantum walk as a generator for non-classical position states of the walker. We exploit a phenomenon of coherent localization in the position space - resulting from the choice of small values of the coin parameter and assisted by post-selection -...

Full description

Bibliographic Details
Main Authors: Helena Majury, Joelle Boutari, Elizabeth O’Sullivan, Alessandro Ferraro, Mauro Paternostro
Format: Article
Language:English
Published: SpringerOpen 2018-01-01
Series:EPJ Quantum Technology
Online Access:http://link.springer.com/article/10.1140/epjqt/s40507-017-0065-9
id doaj-9adc4b1b9a7e4fa2aa5aa7ce5c765829
record_format Article
spelling doaj-9adc4b1b9a7e4fa2aa5aa7ce5c7658292020-11-24T23:13:30ZengSpringerOpenEPJ Quantum Technology2196-07632018-01-015111210.1140/epjqt/s40507-017-0065-9Robust quantum state engineering through coherent localization in biased-coin quantum walksHelena Majury0Joelle Boutari1Elizabeth O’Sullivan2Alessandro Ferraro3Mauro Paternostro4Centre for Secure Information Technologies (CSIT), Queen’s UniversityClarendon Laboratory, University of OxfordCentre for Secure Information Technologies (CSIT), Queen’s UniversityCentre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen’s UniversityCentre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen’s UniversityAbstract We address the performance of a coin-biased quantum walk as a generator for non-classical position states of the walker. We exploit a phenomenon of coherent localization in the position space - resulting from the choice of small values of the coin parameter and assisted by post-selection - to engineer large-size coherent superpositions of position states of the walker. The protocol that we design appears to be remarkably robust against both the actual value taken by the coin parameter and strong dephasing-like noise acting on the spatial degree of freedom. We finally illustrate a possible linear-optics implementation of our proposal, suitable for both bulk and integrated-optics platforms.http://link.springer.com/article/10.1140/epjqt/s40507-017-0065-9
collection DOAJ
language English
format Article
sources DOAJ
author Helena Majury
Joelle Boutari
Elizabeth O’Sullivan
Alessandro Ferraro
Mauro Paternostro
spellingShingle Helena Majury
Joelle Boutari
Elizabeth O’Sullivan
Alessandro Ferraro
Mauro Paternostro
Robust quantum state engineering through coherent localization in biased-coin quantum walks
EPJ Quantum Technology
author_facet Helena Majury
Joelle Boutari
Elizabeth O’Sullivan
Alessandro Ferraro
Mauro Paternostro
author_sort Helena Majury
title Robust quantum state engineering through coherent localization in biased-coin quantum walks
title_short Robust quantum state engineering through coherent localization in biased-coin quantum walks
title_full Robust quantum state engineering through coherent localization in biased-coin quantum walks
title_fullStr Robust quantum state engineering through coherent localization in biased-coin quantum walks
title_full_unstemmed Robust quantum state engineering through coherent localization in biased-coin quantum walks
title_sort robust quantum state engineering through coherent localization in biased-coin quantum walks
publisher SpringerOpen
series EPJ Quantum Technology
issn 2196-0763
publishDate 2018-01-01
description Abstract We address the performance of a coin-biased quantum walk as a generator for non-classical position states of the walker. We exploit a phenomenon of coherent localization in the position space - resulting from the choice of small values of the coin parameter and assisted by post-selection - to engineer large-size coherent superpositions of position states of the walker. The protocol that we design appears to be remarkably robust against both the actual value taken by the coin parameter and strong dephasing-like noise acting on the spatial degree of freedom. We finally illustrate a possible linear-optics implementation of our proposal, suitable for both bulk and integrated-optics platforms.
url http://link.springer.com/article/10.1140/epjqt/s40507-017-0065-9
work_keys_str_mv AT helenamajury robustquantumstateengineeringthroughcoherentlocalizationinbiasedcoinquantumwalks
AT joelleboutari robustquantumstateengineeringthroughcoherentlocalizationinbiasedcoinquantumwalks
AT elizabethosullivan robustquantumstateengineeringthroughcoherentlocalizationinbiasedcoinquantumwalks
AT alessandroferraro robustquantumstateengineeringthroughcoherentlocalizationinbiasedcoinquantumwalks
AT mauropaternostro robustquantumstateengineeringthroughcoherentlocalizationinbiasedcoinquantumwalks
_version_ 1725598085003870208

Similar Items