Localized quantum walks as secured quantum memory

C. M. Chandrashekar, Th. Busch
2015 Europhysics letters  
We show that a quantum walk process can be used to construct and 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, unknown qubit on a compact position space and faithfully recover it on demand. Since the localization occurss with a finite spread in position space, the stored information of the qubit will be naturally secured from the simple eavesdropper. Our protocol can be adopted to any
more » ... antum system for which experimental control over quantum walk dynamics can be achieved.
doi:10.1209/0295-5075/110/10005 fatcat:s4w4aftnq5cethc7cfkzrt2adq