Experimental demonstration of the DPTS QKD protocol over a 170 km fiber link

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Abstract

Quantum key distribution (QKD) is a promising technology that aims to solve the security problem arising from the advent of quantum computers. While the main theoretical aspects are well developed today, limited performances, in terms of the achievable link distance and the secret key rate, are preventing the deployment of this technology on a large scale. More recent QKD protocols, which use multiple degrees of freedom for encoding of the quantum states, allow enhancement of the system performances. Here, we present the experimental demonstration of the differential phase-time shifting protocol up to 170 km of the fiber link. We compare its performance with the well-known coherent one-way and differential phase shifting protocols, demonstrating a higher secret key rate up to 100 km. Moreover, we propagate a classical signal in the same fiber, proving the compatibility of quantum and classical light.
Original languageEnglish
Article number011101
JournalApplied Physics Letters
Volume114
Issue number1
Number of pages5
ISSN0003-6951
DOIs
Publication statusPublished - 2019

Cite this

@article{317edc611a7e4cad9049c680f5d03514,
title = "Experimental demonstration of the DPTS QKD protocol over a 170 km fiber link",
abstract = "Quantum key distribution (QKD) is a promising technology that aims to solve the security problem arising from the advent of quantum computers. While the main theoretical aspects are well developed today, limited performances, in terms of the achievable link distance and the secret key rate, are preventing the deployment of this technology on a large scale. More recent QKD protocols, which use multiple degrees of freedom for encoding of the quantum states, allow enhancement of the system performances. Here, we present the experimental demonstration of the differential phase-time shifting protocol up to 170 km of the fiber link. We compare its performance with the well-known coherent one-way and differential phase shifting protocols, demonstrating a higher secret key rate up to 100 km. Moreover, we propagate a classical signal in the same fiber, proving the compatibility of quantum and classical light.",
author = "{da Lio}, Beatrice and Davide Bacco and Daniele Cozzolino and Y. Ding and K. Dalgaard and Karsten Rottwitt and Oxenl{\o}we, {Leif Katsuo}",
year = "2019",
doi = "10.1063/1.5049659",
language = "English",
volume = "114",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics",
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TY - JOUR

T1 - Experimental demonstration of the DPTS QKD protocol over a 170 km fiber link

AU - da Lio, Beatrice

AU - Bacco, Davide

AU - Cozzolino, Daniele

AU - Ding, Y.

AU - Dalgaard, K.

AU - Rottwitt, Karsten

AU - Oxenløwe, Leif Katsuo

PY - 2019

Y1 - 2019

N2 - Quantum key distribution (QKD) is a promising technology that aims to solve the security problem arising from the advent of quantum computers. While the main theoretical aspects are well developed today, limited performances, in terms of the achievable link distance and the secret key rate, are preventing the deployment of this technology on a large scale. More recent QKD protocols, which use multiple degrees of freedom for encoding of the quantum states, allow enhancement of the system performances. Here, we present the experimental demonstration of the differential phase-time shifting protocol up to 170 km of the fiber link. We compare its performance with the well-known coherent one-way and differential phase shifting protocols, demonstrating a higher secret key rate up to 100 km. Moreover, we propagate a classical signal in the same fiber, proving the compatibility of quantum and classical light.

AB - Quantum key distribution (QKD) is a promising technology that aims to solve the security problem arising from the advent of quantum computers. While the main theoretical aspects are well developed today, limited performances, in terms of the achievable link distance and the secret key rate, are preventing the deployment of this technology on a large scale. More recent QKD protocols, which use multiple degrees of freedom for encoding of the quantum states, allow enhancement of the system performances. Here, we present the experimental demonstration of the differential phase-time shifting protocol up to 170 km of the fiber link. We compare its performance with the well-known coherent one-way and differential phase shifting protocols, demonstrating a higher secret key rate up to 100 km. Moreover, we propagate a classical signal in the same fiber, proving the compatibility of quantum and classical light.

U2 - 10.1063/1.5049659

DO - 10.1063/1.5049659

M3 - Journal article

VL - 114

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 1

M1 - 011101

ER -