Using entanglement in the path degree of freedom, controlled via polarization, the researchers prepared three- and four-particle GHZ states in three-level systems (qutrits). The results show violations of local-hidden-variable theories stronger than those achievable with qubits, paving the way for more powerful quantum protocols.
Key highlights:
* High-dimensional, multi-partite entanglement
* Efficient generation of qutrit GHZ states
* Stronger non-locality than qubit systems allow
* New directions for quantum communication and computation.
Important step for more complex quantum computing and communication protocols
A new study has recently been published in Nature Communications: “Observation of Genuine High-dimensional Multi-partite Non-locality in Entangled Photon States”. This work marks a significant advancement in high-dimensional quantum technologies, demonstrating, for the first time, genuine multi-partite non-locality in entangled photon states beyond qubit systems. Nicola D’Alessandro, Gabriele Cobucci, and Armin Tavakoli are among the authors.