najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2016-7-2-371-377najo-835Research ArticleCONTRIBUTED TALKSCONTRIBUTED TALKSTemperature dependence of the optical fiber cable parameters in subcarrier wave quantum communication systemsTemperature dependence of the optical fiber cable parameters in subcarrier wave quantum communication systemsDubrovskaiaV. D.DubrovskaiaV. D.

St. Petersburg

St. Petersburg

vddubrovskaia@gmail.comChivilikhinS. A.ChivilikhinS. A.

St. Petersburg

St. Petersburg

ITMO UniversityITMO University20161308202572Special Issue371377Copyright © Dubrovskaia V.D., Chivilikhin S.A., 20252025Dubrovskaia V.D., Chivilikhin S.A.Dubrovskaia V.D., Chivilikhin S.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/835

A common approach to establishing long-distance synchronization links in quantum communication (QC) systems is based on using optical signals transmitted in cables, where they decay and are distorted. It is necessary to evaluate the transformation of the signal parameters during propagation and their influence on the QC systems. We investigate the temperature dependence of the synchronization signal phase of a subcarrier wave quantum communication system (SCWQC) in optical fiber cables. A temperature model was created in order to determine the signal phase delay in the cable. We estimate the influence of daily temperature fluctuations on the phase delay in ground- and air-based cables. For systems operating with ground-based cables, they do not have any significant impact on the synchronization of the signal phase. However, for systems operating through air-based cables, phase adjustment is required every 158 ms for stable operation. This allowed us to optimize the parameters for a calibration procedure of a previously-developed SCWQC system, increasing the overall sifted key generation rate.

A common approach to establishing long-distance synchronization links in quantum communication (QC) systems is based on using optical signals transmitted in cables, where they decay and are distorted. It is necessary to evaluate the transformation of the signal parameters during propagation and their influence on the QC systems. We investigate the temperature dependence of the synchronization signal phase of a subcarrier wave quantum communication system (SCWQC) in optical fiber cables. A temperature model was created in order to determine the signal phase delay in the cable. We estimate the influence of daily temperature fluctuations on the phase delay in ground- and air-based cables. For systems operating with ground-based cables, they do not have any significant impact on the synchronization of the signal phase. However, for systems operating through air-based cables, phase adjustment is required every 158 ms for stable operation. This allowed us to optimize the parameters for a calibration procedure of a previously-developed SCWQC system, increasing the overall sifted key generation rate.

quantum communicationsclock synchronizationtemperature dependence of the signalquantum communicationsclock synchronizationtemperature dependence of the signalThis work was partially financially supported by the Government of the Russian Federation (grant 074-U01).This work was partially financially supported by the Government of the Russian Federation (grant 074-U01).ReferencesScarani V., Bechmann-Pasquinucci H., et al. The security of practical quantum key distribution. Reviews of modern physics, 2009, 81, P. 1302–1345.Scarani V., Bechmann-Pasquinucci H., et al. The security of practical quantum key distribution. Reviews of modern physics, 2009, 81, P. 1302–1345.Bennett C., Brassard G. Quantum cryptography: Public key distribution and coin tossing. Proceedings of IEEE International Conference on Computers. Systems and Signal Processing, 1984, P. 175–179.Bennett C., Brassard G. Quantum cryptography: Public key distribution and coin tossing. Proceedings of IEEE International Conference on Computers. Systems and Signal Processing, 1984, P. 175–179.Korzh B., Wen Lim C.C., et al. Provably secure and practical quantum key distribution over 307 km of optical fibre. Nature Photonics, 2015, 9, P. 163–168.Korzh B., Wen Lim C.C., et al. Provably secure and practical quantum key distribution over 307 km of optical fibre. Nature Photonics, 2015, 9, P. 163–168.Wang S., Chen W., et al. 2 GHz clock quantum key distribution over 260 km of standard telecom fiber. Optics letters, 2012, 37(6), P. 1008–1010.Wang S., Chen W., et al. 2 GHz clock quantum key distribution over 260 km of standard telecom fiber. Optics letters, 2012, 37(6), P. 1008–1010.Merolla J.-M., Mazurenko Y., et al. Phase-modulation transmission system for quantum cryptography. Optics letters, 1999, 24(2), P. 104–106.Merolla J.-M., Mazurenko Y., et al. Phase-modulation transmission system for quantum cryptography. Optics letters, 1999, 24(2), P. 104–106.Egorov V.I., Vavulin D.N., et al. Analysis of a sidebands-based quantum cryptography system with different detector types. Nanosystems: physics, chemistry, mathematics, 2013, 4(2), P. 190–195.Egorov V.I., Vavulin D.N., et al. Analysis of a sidebands-based quantum cryptography system with different detector types. Nanosystems: physics, chemistry, mathematics, 2013, 4(2), P. 190–195.Gleim A.V., Anisimov A.A., et al. Quantum key distribution in an optical fiber at distances of up to 200 km and a bit rate of 180 bit/s. Bulletin of the Russian Academy of Sciences: Physics, 2014, 78(3), P. 171–175.Gleim A.V., Anisimov A.A., et al. Quantum key distribution in an optical fiber at distances of up to 200 km and a bit rate of 180 bit/s. Bulletin of the Russian Academy of Sciences: Physics, 2014, 78(3), P. 171–175.Gleim A.V., Egorov V.I., et al. Polarization Insensitive 100 MHz Clock Subcarrier Quantum Key Distribution over a 45 dB Loss Optical Fiber Channel. Proceeding of “CLEO: 2015 – Laser Science to Photonic Applications”, OSA, 2015.Gleim A.V., Egorov V.I., et al. Polarization Insensitive 100 MHz Clock Subcarrier Quantum Key Distribution over a 45 dB Loss Optical Fiber Channel. Proceeding of “CLEO: 2015 – Laser Science to Photonic Applications”, OSA, 2015.Rezak E., Prokopovich M. Errors accounting of optical fiber length measurment. Vestn. TOGU, 2008, 4, P. 167–171.Rezak E., Prokopovich M. Errors accounting of optical fiber length measurment. Vestn. TOGU, 2008, 4, P. 167–171.Carslaw H.S., Jaeger J.C. Conduction of heat in solids. Clarendon Press, Oxford, 1959, 510 p.Carslaw H.S., Jaeger J.C. Conduction of heat in solids. Clarendon Press, Oxford, 1959, 510 p.

The authors declare that there are no conflicts of interest present.