# Classical realization of the quantum Deutsch algorithm

## TL;DR

This paper introduces a simple, accessible classical optical implementation of the Deutsch algorithm, making quantum computation concepts more understandable and reproducible in basic educational settings.

## Contribution

It presents a novel classical analogue of the quantum Deutsch algorithm using elementary optical devices, simplifying experimental realization and educational demonstration.

## Key findings

- Classical optical setup successfully mimics the Deutsch algorithm
- Implementation is easily reproducible in undergraduate laboratories
- Enhances understanding of quantum computation principles

## Abstract

In the rapidly growing area of quantum information, the Deutsch algorithm is ubiquitous and, in most cases, the first one to be introduced to any student of this relatively new field of research. The reason for this historical relevance stems from the fact that, although extremely simple, the algorithm conveys all the main features of more complex quantum computations. In spite of its simplicity, the uncountable experimental realizations of the algorithm in a broad variety of physical systems are in general quite involved. The aim of this work is two-fold: to introduce the basic concepts of quantum computation for readers with just a minimum knowledge of quantum mechanics and to present a novel and entirely accessible implementation of a classical analogue of the quantum Deutsch algorithm. By employing only elementary optical devices, such as lenses and diode lasers, this experimental realization has a striking advantage over all previous implementations: it can easily be understood and reproduced in most basic undergraduate or even high-level school laboratories.