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Analytical solution to the problem of polarization drift compensation in an all-fiber QKD system
Optics Express. 2024. Vol. 32. No. 26. P. 45421–45435.
Mayboroda V., Rudavin Nikita, Kupriyanov P., Fat’yanov O., Shakhovoy R.
A method for simultaneous compensation of polarization drift in a fiber-optic quantum channel, and a fully fiber-optic receiver has been successfully developed, implemented, and tested using a commercial QKD system. The method is based on the exact analytical solution we derived, which gives the necessary corrective transformation for polarization. Noise and imperfections in any realistic system require iterative application of the computed corrections. In our case, polarization drift compensation was completed on average in 2-3 iterations. This is an improvement by a factor of 10-100 compared to the common methods based on hill-climbing algorithms.
Vladimir I. Morozov, Mikhail S. Elezov, Oleg O. Evsutin et al., IEEE Access 2026 Vol. 14 P. 343–354
Error correction is a crucial stage in quantum key distribution (QKD) protocols — a promising field of modern cryptography where the secrecy of the shared key information is guaranteed by the laws of quantum mechanics. Currently, there are many effective approaches to error correction in QKD. However, most of them, due to their generic nature, ...
Added: January 6, 2026
Morozov V., Oleg Evsutin, Nikita Yarygin, , in: 2025 XIХ International Symposium on Problems of Redundancy in Information and Control Systems (Redundancy), 5-7 Nov. 2025.: IEEE, 2025. P. 1–7.
Quantum Key Distribution (QKD) is a promising field in modern cryptography where the security of key information is guaranteed by the laws of quantum mechanics. One of the key stages in QKD protocols is error estimation and reconciliation in the secret key. This procedure requires the transmission of a certain number of secret key bits ...
Added: December 30, 2025
Ponosova A., Zhluktova I., Ruzhitskaya D. et al., Applied Physics Letters 2025 Vol. 127 No. 19 P. 194002
Quantum key distribution systems offer cryptographic security, provided that all their components are thoroughly characterized. However, certain components might be vulnerable to laser-damage attacks, particularly when subjected to untested laser parameters. Here, we show that exposing 1550-nm fiber-optic isolators to 1061-nm sub-nanosecond pulsed illumination with 1.16 W average power permanently degrades their isolation performance at ...
Added: December 5, 2025
Daniil Trefilov, Sixto X., Zapatero V. et al., Optica Quantum 2025 Vol. 3 No. 5 P. 417–431
The decoy-state method is a prominent approach to enhance the performance of quantum key distribution (QKD) systems that operate with weak coherent laser sources. Due to the limited transmissivity of single photons in optical fiber, current experimental decoy-state QKD setups increase their secret key rate by raising the repetition rate of the transmitter. However, this ...
Added: September 20, 2025
Morozov V., Башара В. О., Емельяненко М. В., В кн.: Параллельные вычислительные технологии – XIX всероссийская научная конференция с международным участием, ПаВТ’2025, г. Москва, 8–10 апреля 2025 г. Короткие статьи и описания плакатов.: Челябинск: Издательский центр ЮУрГУ, 2025. С. 193–210.
Error correction in the secret key is a mandatory step in quantum key distribution (QKD) protocols. Usually, modern error-correcting codes are used for its implementation. Imperfections of the hardware used in QKD systems lead to bit flipping errors in the channel. Moreover, such systems are characterized by an asymmetric distribution of such errors. Taking into ...
Added: June 3, 2025
Duplinsky A., Khmelev A., Bakhshaliev R. et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2024 Vol. 17 No. 3 P. 88 – 92
Added: May 13, 2025
V. I. Morozov, O. O. Evsyutin, S. I. Nefedov, Problems of Information Transmission 2025 Vol. 61 No. 1 P. 8–26
One of the main applications of quantum communication is quantum key distribution, which solves the problem of secure distribution of cryptographic keys between remote users. This paper investigates the performance of a phase-time coding quantum key distribution protocol belonging to the BB84 protocol family. We construct a simulation model that takes into account the peculiarities ...
Added: April 22, 2025
Makarov V., Abrikosov A., Chaiwongkhot P. et al., Physical Review Applied 2024 Vol. 22 No. 4 P. 044076-1–044076-34
A commercial quantum key distribution (QKD) system needs to be formally certified to enable its wide deployment. The certification should include the system’s robustness against known implementation loopholes and attacks that exploit them. Here we ready a fiber-optic QKD system for this procedure. The system has a prepare-and-measure scheme with decoy-state BB84 protocol, polarization encoding, ...
Added: December 8, 2024
Ruzhitskaya D., Zhluktova I., Ponosova A. et al., Conference on Lasers and Electro-Optics/Europe (CLEO/Europe 2023) and European Quantum Electronics Conference 2023 Article eb_p_14
Quantum key distribution (QKD) systems provide quantum-safe key exchange. Therefore, complete security analysis of implementations of QKD protocols is in the focus of interest of a worldwide information-security community. For today, a number of QKD loopholes are closed by countermeasures, which are also considered in emerging QKD security evaluation and certification [1–3]. However, new threats ...
Added: September 13, 2024
Nefedov S., Ozhegov R., Evsyutin O. et al., Наноиндустрия 2024 Т. 17 № S10-2 (128) С. 553–558
The paper considers challenges of creating a quantum key distribution system for long-distance trunk line. Besides, it presents the results of design, prototyping and examination of equipment implementing the quantum key distribution protocol with phase-time coding. ...
Added: August 2, 2024
Khmelev A., Duplinsky A, Bakhshaliev R et al., Optics Express 2024 Vol. 32 No. 7 P. 11964–11978
The Micius satellite is the pioneering initiative to demonstrate quantum teleportation, entanglement distribution, quantum key distribution (QKD), and quantum-secured communications experiments at the global scale. In this work, we report on the results of the 600-mm-aperture ground station design which has enabled the establishment of a quantum-secured link between the Zvenigorod and Nanshan ground stations ...
Added: April 25, 2024
Miller A., Pismenuk L., Duplinsky AV et al., EPJ QUANTUM TECHNOLOGY 2023 Vol. 10 No. 1 Article 52
A satellite-constellation based global quantum network could allow secure quantum communication between remote users worldwide. Such a constellation could be formed of micro- or even nanosatellites, which have the advantage of being more cost-effective than larger expensive spacecrafts. At the same time, the features of quantum communication impose a number of technical requirements that are ...
Added: April 25, 2024
Дуплинский А. В., Хмелев А. В., Мерзлинкин В. Е. et al., Вестник Томского государственного университета. Управление, вычислительная техника и информатика 2023 № 63 С. 103–110
Quantum key distribution is a technology that allows you to generate an encryption key with a high level of secrecy for the secure exchange of information between users. In the last decade, the concept of quantum secure communications has become increasingly widespread around the world. This article outlines the idea of a quantum key distribution ...
Added: April 25, 2024
Khmelev A., Ivchenko E., Miller A. et al., Entropy 2023 Vol. 25 No. 4 P. 670
Satellite-based link analysis is valuable for efficient and secure quantum communication, despite seasonal limits and restrictions on transmission times. A semi-empirical quantum key distribution model for satellite-based systems was proposed that simplifies simulations of communication links. Unlike other theoretical models, our approach was based on the experimentally-determined atmospheric extinction coefficient typical for mid-latitude ground stations. ...
Added: May 11, 2023
Merzlinkin V., Khmelev A., Duplinsky AV et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2022 Vol. 15 No. 3.3 P. 202–206
Quantum communication is a transmission technology that allows legitimate users to share a secret key. The BB84 protocol employs four linear polarization states for encoding in our quantum key distribution system. However, the optical elements affect the polarization features of quantum state, which leads to errors in decoded key. To reduce mistakes and increase device ...
Added: May 11, 2023
Beutel F., Brückerhoff-Plückelmann F., Gehring H. et al., Optica 2022 Vol. 9 No. 10 P. 1121–1130
Quantum key distribution(QKD) enables secure communication even in the presence ofadvancedquantumcomputers. However, scaling up discrete-variable QKD to high key rates remains a challenge due to the lossy nature ofquantum communication channels and the use of weak coherent states. Photonic integration and massive parallelization are crucial steps toward the goal of high-throughput secret-key distribution. We present ...
Added: January 30, 2023
Duplinsky AV, Khmelev A., Merzlinkin V. et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2022 Vol. 15 No. 3.2 P. 61–64
Quantum key distribution (QKD) in a space-Earth communication link is a difficult technical task. Aside from precise mutual pointing of the optical axes during the satellite QKD session, the polarization reference frame coincidence of the satellite and the receiving station is also required. Satellite motion causes a rotation of the polarization reference frame in respect ...
Added: December 19, 2022
G. B. Marshalko, Rudskoy V. I., Математические вопросы криптографии 2020 Vol. 11 No. 2 P. 99–110
We study the possibility of applying related key attacks to cryptographic devices with hybrid key systems, when a session key is generated from a long-term «classical» key and a key generated via quantum key distribution (QKD). For the simplest system that XORes quantum key and long-term key we study the impact of compromising the «quantum» ...
Added: October 7, 2022
Khmelev A. V., Duplinsky AV, Kurochkin V. L. et al., Journal of Physics: Conference Series 2021 Vol. 2086 No. 1 P. 012137
Satellite quantum communication is the technology that allows to deploy large-scale quantum networks with a communication range of thousands kilometres We report the ground receiver for downlink quantum key distribution (QKD) with satellite. An optical part of this system including an active tracking loop is mounted on a 600-mm Ritchey-Chretien telescope and permits to distinguish ...
Added: May 18, 2022
Kurochkin V., Khmelev A., Bakhshaliev R. et al., Proceedings of SPIE 2022 No. 12157 P. 492–499
Long-distance quantum key distribution (QKD) is a critical component of a quantum network. When network users are within a city, they often use existing telecommunication fiber-optic networks. This method is problematic for QKD on a large scale between cities and countries. Direct connecting of distant consumers with quantum single-photon lines is not possible, because optical ...
Added: May 18, 2022
Duplinskiy A., Sych D., Physical Review A: Atomic, Molecular, and Optical physics 2021 Vol. 104 No. 1 Article 012601
Passive side-channel attacks in quantum key distribution (QKD) aim at obtaining information about the quantum signals without disturbing them and hence compromise real-world QKD security. Currently, there are no reliable tools for the assessment of QKD signal generation imperfections. In this work we propose a generic experimental method which allows to upper-bound QKD light-source imperfections ...
Added: October 8, 2021