• Open Access

Orbital Angular Momentum States Enabling Fiber-based High-dimensional Quantum Communication

Daniele Cozzolino, Davide Bacco, Beatrice Da Lio, Kasper Ingerslev, Yunhong Ding, Kjeld Dalgaard, Poul Kristensen, Michael Galili, Karsten Rottwitt, Siddharth Ramachandran, and Leif Katsuo Oxenløwe
Phys. Rev. Applied 11, 064058 – Published 25 June 2019

Abstract

Quantum networks are the ultimate target in quantum communication, where many connected users can share information carried by quantum systems. The keystones of such structures are the reliable generation, transmission, and manipulation of quantum states. Two-dimensional quantum states, qubits, are steadily adopted as information units. However, high-dimensional quantum states, qudits, constitute a richer resource for future quantum networks, exceeding the limitations imposed by the ubiquitous qubits. The generation and manipulation of such D-level systems have been improved over the last ten years, but their reliable transmission between remote locations remains the main challenge. Here, we show how a recent air-core fiber supporting orbital angular momentum (OAM) modes can be exploited to faithfully transmit D-dimensional states. Four OAM quantum states and their superpositions are created, propagated in a 1.2-km-long fiber and detected with high fidelities. In addition, three quantum-key-distribution protocols are implemented as concrete applications to assert the practicality of our results. This experiment enhances the distribution of high-dimensional quantum states, attesting the orbital angular momentum as a vessel for the future quantum network.

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  • Received 12 December 2018
  • Revised 29 May 2019

DOI:https://doi.org/10.1103/PhysRevApplied.11.064058

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Daniele Cozzolino1,*, Davide Bacco1,†, Beatrice Da Lio1, Kasper Ingerslev1, Yunhong Ding1, Kjeld Dalgaard1, Poul Kristensen2, Michael Galili1, Karsten Rottwitt1, Siddharth Ramachandran3, and Leif Katsuo Oxenløwe1

  • 1CoE SPOC, Dep. Photonics Eng., Technical University of Denmark, Kgs. Lyngby 2800, Denmark
  • 2OFS-Fitel, Priorparken 680, DK-2605 Broendby, Denmark
  • 3Electrical and Computer Engineering Department, Boston University, 8 St Mary’s St, Boston, Massachusetts, USA

  • *dacoz@fotonik.dtu.dk
  • dabac@fotonik.dtu.dk

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Vol. 11, Iss. 6 — June 2019

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