Preparing the deployment of quantum key distribution over a classical network infrastructure in Prague

Tomáš Novák; Elisabeth Andriantsarazo; Carlos Guerra-Yánez; Petr Pospíšil; Josef Vojtěch

doi:10.1117/12.2665653

6 June 2023 Preparing the deployment of quantum key distribution over a classical network infrastructure in Prague

Tomáš Novák, Elisabeth Andriantsarazo, Carlos Guerra-Yánez, Petr Pospíšil, Josef Vojtěch

Proceedings Volume 12570, Quantum Optics and Photon Counting 2023; 1257005 (2023) https://doi.org/10.1117/12.2665653
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Quantum Key Distribution (QKD) is a promising tool for secure communication in the near future. In combination with one-time-pad technique, it provides an unconditionally secure communication channel (meaning that it is secure against an adversary, even with unlimited computational power), at least in principle. However, a major implementation challenge for some schemes is the reliable creation, transportation, and measurement of entangled photon pairs over long-distance fiber networks. Our project aims to explore the possibilities for distributing quantum information on an existing network infrastructure while measuring the effects of real-world conditions. We characterized a commercial source of entangled photons. We measured its spectrum, brightness (1.6±0.3)×10⁴ pairs/s/μW, and performed quantum state tomography (QST) to reconstruct the density matrix of the quantum state. Our implementation focuses on an all-fiber solution, which would enable a simplified QKD implementation. In laboratory conditions, we achieved the visibility equal to (0.957 ± 0.004) as a mean in both bases with a coincidence rate of (275 ± 4) counts/s and successfully ran QKD protocol with secret key rate of (86 ± 1) bits/s and average quantum bit error rate (QBER) of (4.8 ± 0.7) %.

Conference Presentation

Citation Download Citation

Tomáš Novák, Elisabeth Andriantsarazo, Carlos Guerra-Yánez, Petr Pospíšil, and Josef Vojtěch "Preparing the deployment of quantum key distribution over a classical network infrastructure in Prague", Proc. SPIE 12570, Quantum Optics and Photon Counting 2023, 1257005 (6 June 2023); https://doi.org/10.1117/12.2665653

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