Interface between path and orbital angular momentum entanglement for high-dimensional photonic quantum information

Robert Fickler (), Radek Lapkiewicz, Marcus Huber, Martin P.J. Lavery, Miles J. Padgett and Anton Zeilinger ()
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Robert Fickler: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
Radek Lapkiewicz: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna
Marcus Huber: Fisica Teorica: Informacio i Fenomens Quantics, Departament de Fisica, Universitat Autonoma de Barcelona
Martin P.J. Lavery: School of Physics and Astronomy, Scottish Universities Physics Alliance (SUPA), University of Glasgow
Miles J. Padgett: School of Physics and Astronomy, Scottish Universities Physics Alliance (SUPA), University of Glasgow
Anton Zeilinger: Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Photonics has become a mature field of quantum information science, where integrated optical circuits offer a way to scale the complexity of the set-up as well as the dimensionality of the quantum state. On photonic chips, paths are the natural way to encode information. To distribute those high-dimensional quantum states over large distances, transverse spatial modes, like orbital angular momentum possessing Laguerre Gauss modes, are favourable as flying information carriers. Here we demonstrate a quantum interface between these two vibrant photonic fields. We create three-dimensional path entanglement between two photons in a nonlinear crystal and use a mode sorter as the quantum interface to transfer the entanglement to the orbital angular momentum degree of freedom. Thus our results show a flexible way to create high-dimensional spatial mode entanglement. Moreover, they pave the way to implement broad complex quantum networks where high-dimensionally entangled states could be distributed over distant photonic chips.

Date: 2014
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DOI: 10.1038/ncomms5502

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