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, Anton Zeilinger

Research output: Contribution to journalArticleResearchpeer-review

110 Citations (Scopus)

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. © 2014 Macmillan Publishers Limited.
Original languageEnglish
Article number4502
JournalNature Communications
Volume5
DOIs
Publication statusPublished - 30 Jul 2014

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