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Entropy 2019, 21(1), 80; https://doi.org/10.3390/e21010080

Efficient High-Dimensional Quantum Key Distribution with Hybrid Encoding

1
Department of Physics, Sogang University, Seoul 04107, Korea
2
Research Institute for Basic Science, Sogang University, Seoul 04107, Korea
3
Korea Research Institute of Standards and Science, Daejeon 34113, Korea
4
Quantum Universe Center, Korea Institute for Advanced Study, Seoul 02455, Korea
*
Author to whom correspondence should be addressed.
Received: 26 December 2018 / Revised: 11 January 2019 / Accepted: 14 January 2019 / Published: 17 January 2019
(This article belongs to the Special Issue Entropic Uncertainty Relations and Their Applications)
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Abstract

We propose a schematic setup of quantum key distribution (QKD) with an improved secret key rate based on high-dimensional quantum states. Two degrees-of-freedom of a single photon, orbital angular momentum modes, and multi-path modes, are used to encode secret key information. Its practical implementation consists of optical elements that are within the reach of current technologies such as a multiport interferometer. We show that the proposed feasible protocol has improved the secret key rate with much sophistication compared to the previous 2-dimensional protocol known as the detector-device-independent QKD. View Full-Text
Keywords: quantum cryptography; quantum key distribution; high-dimensional quantum states quantum cryptography; quantum key distribution; high-dimensional quantum states
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jo, Y.; Park, H.S.; Lee, S.-W.; Son, W. Efficient High-Dimensional Quantum Key Distribution with Hybrid Encoding. Entropy 2019, 21, 80.

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