Scalable Generation and Characterization of a Four-Photon Twelve-Qubit Hyperentangled State

TL;DR

This paper proposes a practical method to generate a 12-qubit hyperentangled state using four photons entangled in multiple degrees of freedom, and analyzes its quantum non-locality through Bell inequality violations.

Contribution

It introduces a feasible experimental scheme for creating complex hyperentangled states and investigates their non-local properties, advancing quantum information processing capabilities.

Findings

The scheme successfully generates a 12-qubit hyperentangled state.

The state exhibits strong violation of Bell-type inequalities.

Results align with quantum mechanics and contradict local realism.

Abstract

An experimentally feasible scheme for generating a 12-qubit hyperentangled state via four photons, entangled in polarization, frequency and spatial mode, is proposed. We study the nature of quantum non-locality of this hyperentangled state by evaluating its violation degree to a Bell-type inequality, and find that the result agrees well with quantum mechanics prediction while extremely contradicts to the local realism constraint.