Related Experiment Video
Updated: May 16, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Experimental characterization of two spatial qutrits using entanglement witnesses
A J Gutiérrez-Esparza1, W M Pimenta, B Marques
1Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. agutierrez@fisica.ugto.mx
Abstract:
We present an experimental technique for a complete characterization of entanglement in a two-qutrit state generated using transverse spatial correlations of two parametric down-converted photons. We verify entanglement for a particular case via entanglement witness operators which are decomposed into a sum of local observables of single path and superposition projection operators. Experimentally, these operators are accomplished by using a spatial light modulator and a polarizing beam splitter which allow to modulate the amplitude of individually chosen path states. The quantification of entanglement is computed by the negativity obtained from the expectation values of the entanglement witnesses implemented.
Related Concept Videos
First Law: Particles in Two-dimensional Equilibrium
Newton's first law tells us about the...
Second Uniqueness Theorem
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the surface...
The Quantum-Mechanical Model of an Atom
Space-Time Curvature and the General Theory of Relativity
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
Calculation of First-Law Quantities II
