Pasar al contenido principal

Main navigation

  • Sobre El ITEFI
  • Investigación
  • Formación y empleo
  • OpenLab
  • Servicios científico técnicos
  • Directorio

Double-Loop Wavefront Tilt Correction for Free- Space Quantum Key Distribution

quantum key distribution
beam steering
beam tracking
free-space quantum communication
quantum cryptography
wavefront tilt correction
A. Ocampos-Guillén, J. Gómez-García, N. Denisenko and V. Fernandez
IEEE Access, vol. 7, pp. 114033-114041, 2019
https://doi.org/10.1109/ACCESS.2019.2933694

Both free-space and optical fiber quantum key distribution (QKD) links will coexist in future quantum networks, requiring efficient coupling between both types of channels. However, wavefront distortions introduced by the atmospheric channel can severely affect this efficiency. Active mechanisms such as precise beam tracking or steering can correct for some of these wavefront distortions, considerably improving the signal-to-noise ratio of the received quantum signal in many scenarios. A tracking system that uses two, instead oftypically one, controlling loops for tilt correction, stabilizes the beam in the whole optical axis of the receiver relaxing the restrictions of the receiver's optical design, and reduces the area of beam fluctuations in the receiver's focal plane a 24% more than a single-loop configuration. The tracking system was characterized in a QKD system at a 300 meter-link in moderate to strong turbulent conditions (Cn2 - 10-14 - 10-13 m-2/3) and an improved coupling efficiency of a factor of 2.1 and 1.6 was obtained for a 9.5 μm-core diameter standard telecommunications Single Mode Fiber (SMF) and a 25 μm-core diameter multimode fiber (MMF), respectively. This reduces the quantum bit error rate (QBER) caused by solar background photons in a 52 % for the former and 39% for the latter, enabling an increase in the secret key rate ofmore than one order ofmagnitude for SMF and a factor of five for MMF. These results are promising for enabling QKD free-space links and their interconnection to fiber optic infrastructure in realistic scenarios of communication networks of high turbulence regimes and daylight conditions.

This work was supported in part by the Ministerio de Economía y Competitividad (MINECO /FEDER, UE), Fondo Social Europeo (FSE) through the Programa Operativo de Empleo Juvenil under Grant TEC2015-70406-R, in part by the Comunidad de Madrid, Spain, through the Project CYNAMON under Grant P2018/TCS-4566, in part by the Co-Financed with FSE and Fondo Europeo de Desarrollo Regional (FEDER) European Union (EU) Funds, and in part by the CSIC Research Platform on Quantum Technologies under Grant PTI-001.

GiCSI

proyecto/s relacionado/s

  • Cybersecurity, Network Analysis and Monitoring for the Next Generation Internet. CYNAMON
    Plan Regional de Investigación Científica e Innovación Tecnológica (Comunidad de Madrid), Fondos Feder, Fondo Social Europeo
Departamento de Acústica y Evaluación No Destructiva (DAEND)
  • GAA: Grupo de Acústica ambiental
  • G CARMA: Grupo de Caracterización de materiales mediante evaluación no destructiva
  • ULAB: Ultrasonidos para el análisis de líquidos y bioingeniería
Departamento de Tecnologías de la Información y Las Comunicaciones (DTIC)
  • GiCP: Grupo de investigación en Ciberseguridad y Protección de la Privacidad
  • GICSI: Grupo de investigación en Criptología y Seguridad de la Información
    • LCQE: Laboratorio de Comunicaciones Cuánticas
  • PSUM: Grupo de Procesamiento de Señal en sistemas Ultrasónicos Multicanal
Departamento de Sensores y Sistemas Ultrasónicos (DSSU)
  • GSTU: Grupo de Sistemas y tecnologías ultrasónicas
  • NoySI: Grupo de Nanosensores y Sistemas Inteligentes
  • RESULT: Resonadores ultrasónicos para cavitación y micromanipulación
  • SENSAVAN: Grupo de Tecnología de Sensores Avanzados
  • QE: Electrónica Cuántica
Laboratorios
  • Laboratorio de Acústica
  • Laboratorio de Metrología Ultrasónica Médica (LMUM)
  • Laboratorio de Comunicaciones Cuánticas
  • Laboratory for International Collaboration in Advanced Biophotonics Imaging

Instituto de Tecnologías Físicas y de la Información Leonardo Torres Quevedo  - ITEFI
C/ Serrano, 144. 28006 - Madrid • Tel.: (+34) 91 561 88 06  Contacto  •  Intranet
EDIFICIO PARCIALMENTE ACCESIBLE POR PERSONAS CON MOVILIDAD REDUCIDA