Orbital angular momentum of photons and the entanglement of Laguerre-Gaussian modes

Author(s): M. Krenn, M. Malik, M. Erhard, A. Zeilinger

Journal: Phil. Trans. R. Soc. Lond. A

Volume: 375

Year: 2017

DOI Number: 10.1098/rsta.2015.0442

Link: Link to publication

Abstract:

The identification of orbital angular momentum (OAM) of light nearly 25 years ago has stimulated a lot of excitement, as it allows for encoding of large amounts of information. Interestingly, this is possible even at the single photon level, which makes this degree an ideal candidate for the investigation of complex quantum phenomena and their applications. Here we explain the intuition that led to the first quantum experiment with photonic OAM 15 years ago. We continue by reviewing some key experiments investigating fundamental questions in quantum physics and the first steps into applying OAM in novel quantum protocols. In the end, we identify several interesting open questions which could form the subject of future investigations with orbital angular momentum.

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