Obtaining entangled photons from fully mixed states using beam splitters

TL;DR

This paper introduces a simple protocol using beam splitters to generate maximally entangled photon states from fully mixed, classical input states, with detailed analysis for multiple photons.

Contribution

It presents a novel, straightforward method for creating entangled photons from classical mixed states using beam splitters, expanding quantum state preparation techniques.

Findings

Maximally entangled states can be generated from classical mixed states.

The protocol works for an arbitrary number of photons.

Detailed theoretical analysis supports the method's validity.

Abstract

Preparation of entangled states of photons are useful for quantum computing and communication. In this paper, we present a simplistic protocol of entanglement generation using beam splitters with suitable reflectivity. The photons in an initial state with fully classical probability distribution pass through an optical network, made up of sequential beam splitters and are prepared in maximally entangled states. We also present the detailed theoretical analysis of entangled state generation, for an arbitrary number of photons, fed through the input ports of the beam splitters with equal probability.