Scalable generation and characterization of a four-photon twelve-qubit hyperentangled state

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 contradicting the local realism constraint.

Keywords:

• hyperentanglement
• Bell inequality
• non-locality
• qubit

Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (NSFC), by the CAS Key Projects KJCX2-yw-N29 and H92A0200S2. We thank Junli Li, Hongbo Xu and Chao Niu for useful discussions.