期刊
NATURE PHOTONICS
卷 12, 期 12, 页码 759-764出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-018-0257-6
关键词
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资金
- Austrian Academy of Sciences (OAW)
- European Research Council (SIQS) [600645 EU-FP7-ICT]
- Austrian Science Fund (FWF) [SFB F40]
- FWF project CoQuS [W1210-N16]
- European Commission through a Marie Curie fellowship
- Czech-Austrian project MultiQUEST [FWF I3053-N27]
- QuantERA ERA-NET Co-fund [FWF I3553-N36]
- Austrian Science Fund (FWF) [I3053, W1210] Funding Source: Austrian Science Fund (FWF)
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.
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