1307.5922 (C. M. Chandrashekar et al.)

Device-independent and secured quantum memory using localised quantum
walks    [PDF]

C. M. Chandrashekar, Th. Busch

We show that a quantum walk process can be used to secure quantum memory. More precisely, we show that a localized quantum walk with temporal disorder can be engineered to store the information of a single qubit on a compact position space and faithfully recover them on demand. Since the localization happens with a finite spread in position space, the stored information of the qubit will be naturally secured from the eavesdropper. Our protocol can be adopted to any quantum system for which experimental control over quantum walk dynamics can be achieved.

View original: http://arxiv.org/abs/1307.5922