Projection of two biphoton qutrits onto a maximally entangled state

TL;DR

This paper presents a method and experimental demonstration for projecting two biphoton qutrits onto a maximally entangled state, advancing quantum information processing with higher-dimensional systems.

Contribution

It introduces a novel approach for Bell state measurements on biphoton qutrits and demonstrates its feasibility using linear optics.

Findings

Successful projection of biphoton qutrits onto maximally entangled states

Experimental validation using standard linear optics elements

Enables quantum protocols like teleportation with qutrits

Abstract

Bell state measurements, in which two quantum bits are projected onto a maximally entangled state, are an essential component of quantum information science. We propose and experimentally demonstrate the projection of two quantum systems with three states (qutrits) onto a generalized maximally entangled state. Each qutrit is represented by the polarization of a pair of indistinguishable photons - a biphoton. The projection is a joint measurement on both biphotons using standard linear optics elements. This demonstration enables the realization of quantum information protocols with qutrits, such as teleportation and entanglement swapping.