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.

Robust quantum state engineering through coherent localization in biased-coin quantum walks / H. Majury, J. Boutari, E. O'Sullivan, A. Ferraro, M. Paternostro. - In: EPJ QUANTUM TECHNOLOGY. - ISSN 2196-0763. - 5:1(2018 Jan 05), pp. 1.1-1.12. [10.1140/epjqt/s40507-017-0065-9]

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

A. Ferraro
Penultimo
;
2018-01-05

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.
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/907768
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