Creation, Characterization, and Manipulation of Quantum Entanglement in a Photonic System

TL;DR

This thesis explores the creation, characterization, and manipulation of quantum entanglement in photonic systems through experimental methods, entanglement measures, and protection schemes against decoherence in multi-dimensional systems.

Contribution

It introduces a comprehensive analysis of entanglement in photonic systems, including experimental techniques, entanglement measures, and novel protection schemes for higher-dimensional entangled states.

Findings

Developed a method for preparing and characterizing SPDC-based polarization-entangled photon sources.

Compared various entanglement measures for non-maximally entangled states and extended analysis to higher dimensions.

Proposed a scheme to protect entanglement from sudden death in two-qubit and higher-dimensional systems.

Abstract

In this thesis, we report the theoretical and experimental investigations towards the creation, characterization, and manipulation of quantum entanglement in a photonic system. We examine two different aspects of quantum entanglement: In the first part, we discuss the experimental method for the preparation and characterization of SPDC-based polarization-entangled photon source. We provide a review study comparing different Entanglement Measures for non-maximally entangled two-qubit pure states and extend this analysis to higher-dimensional systems. In the second part, we study the entanglement dynamics of a two-qubit system in the presence of an Amplitude Damping Channel and present a scheme based on local unitary operations to protect entanglement from undergoing Entanglement Sudden Death. We extend the decoherence study to qubit-qutrit and qutrit-qutrit entangled systems and propose an entanglement protection scheme for the higher dimensional system.