Localized quantum walks as secured quantum memory

TL;DR

This paper demonstrates that localized quantum walks with temporal disorder can be used to create secure, reliable quantum memory by storing and retrieving a qubit in a position space that is naturally protected from eavesdroppers.

Contribution

It introduces a novel method of using localized quantum walks with temporal disorder to securely store and recover quantum information in a compact position space.

Findings

Quantum walk with temporal disorder localizes information.

Stored qubit is protected from eavesdroppers due to localization.

Protocol is adaptable to various quantum systems.

Abstract

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 quantum system for which experimental control over quantum walk dynamics can be achieved.