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Updated: Jun 9, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
A geometric formulation to measure global and genuine entanglement in three-qubit systems
Salvio Luna-Hernández1, Marco Enríquez2, Oscar Rosas-Ortiz1
1Physics Department, Cinvestav, AP 14-740, 07000, México City, Mexico.
Abstract:
We introduce a purely geometric formulation for two different measures addressed to quantify the entanglement between different parts of a tripartite qubit system. Our approach considers the entanglement-polytope defined by the smallest eigenvalues of the reduced density matrices of the qubit-components. The measures identify global and genuine entanglement, and are respectively associated with the projection and rejection of a given point of the polytope on the corresponding biseparable segments. Solving the so called 'inverse problem', we also discuss a way to force the system to behave in a particular form, which opens the possibility of controlling and manipulating entanglement for practical purposes.
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