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Journal Article

Experimental Greenberger-Horne-Zeilinger entanglement beyond qubits

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Erhard, M., Malik, M., Krenn, M., & Zeilinger, A. (2018). Experimental Greenberger-Horne-Zeilinger entanglement beyond qubits. Nature Photonics, 12(12), 759-764. doi:10.1038/s41566-018-0257-6.

Cite as: https://hdl.handle.net/21.11116/0000-0009-65BC-2
Quantum entanglement is important for emerging quantum technologies such as quantum computation and secure quantum networks. To boost these technologies, a race is currently ongoing to increase the number of particles in multiparticle entangled states, such as Greenberger-Horne-Zeilinger (GHZ) states. An alternative route is to increase the number of entangled quantum levels. Here, we overcome present experimental and technological challenges to create a three-particle GHZ state entangled in three levels for every particle. The resulting qutrit-entangled states are able to carry more information than entangled states of qubits. Our method, inspired by the computer algorithm Melvin, relies on a new multi-port that coherently manipulates several photons simultaneously in higher dimensions. The realization required us to develop a new high-brightness four-photon source entangled in orbital angular momentum. Our results allow qualitatively new refutations of local-realistic world views. We also expect that they will open up pathways for a further boost to quantum technologies.