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

Author(s): R. Fickler, R. Lapkiewicz, M. Huber, M. P. J. Lavery, M. J. Padgett, A. Zeilinger

Journal: Nature communications

Volume: 5

Page(s): 4502

Year: 2014

DOI Number: 10.1038/ncomms5502

Link: Link to publication


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.


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