Theoretical analysis of quantum random walks with stress-engineered optics

TL;DR

This paper presents a theoretical framework for implementing quantum random walks using stress-engineered optics, offering a new approach to develop complex QRWs with potential applications in photonic quantum networks.

Contribution

It introduces a novel theoretical method for utilizing stress-engineered optics to realize quantum random walks, expanding the toolkit beyond traditional Q-plates.

Findings

Stress-engineered optics can facilitate complex QRWs.

The approach simplifies the development of QRW platforms.

Potential to accelerate classical-to-quantum transition in photonics.

Abstract

Quantum random walks (QRWs) are random processes in which the resulting probability density of the "walker" state, whose movement is governed by a "coin" state, is described in a non-classical manner. Previously, Q-plates have been used to demonstrate QRWs with polarization and orbital angular momentum playing the role of coin and walker states, respectively. In this theoretical analysis, we show how stress-engineered optics can be used to develop new platforms for complex QRWs through relative simple optical elements. Our work opens up new paths to speed up classical-to-quantum transitions in robust photonic networks.