Hyperentangled mixed phased Dicke states: optical design and detection

TL;DR

This paper introduces an experimental method to generate and analyze 4-qubit phased Dicke states using hyperentangled photons, testing their robustness against quantum noise with a novel entanglement witness.

Contribution

It presents a new optical design for creating and detecting hyperentangled phased Dicke states and introduces a structural witness for entanglement verification in noisy conditions.

Findings

Successfully generated 4-qubit phased Dicke states

Demonstrated robustness of states under controlled quantum noise

Developed a new structural witness for entanglement detection

Abstract

We present an experimental method to produce 4-qubit phased Dicke states, based on a source of 2-photon hyperentangled states. By introducing quantum noise in the multipartite system in a controlled way, we have tested the robustness of these states. To this purpose the entanglement of the resulting multipartite entangled mixed states has been verified by using a new kind of structural witness.