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In this work we introduce a complete Quantum Key Distribution device that implements a decoy-state protocol [1]. Qubits are coded in the polarization state of weak optical pulses, produced by infrared LEDs [2]. The link between Transmission (Alice) and Reception (Bob) stages is open air, which is the preferred channel to eventually through low-orbit satellites establish quantum communications. Both terminals are placed on different rooms, separated by approximately 8 meters. In order to compensate misalignments produced by small mechanic displacements or atmospheric thermal gradients, the system implements a closed-loop for automatic alignment based on a counter-propagating laser, a servo-actuated mirror and a CMOS image sensor. The apparatus runs in an autonomous way, and in the above described conditions it is able to generate raw cryptographic key at a rate of 185 bits/s, with a QBER of 6.15%. © Sociedad Española de Óptica.


Documento: Artículo
Título:Free space decoy-state quantum key distribution implementation
Autor:Magnoni, A.G.; Grande, I.H.L.; Larotonda, M.A.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Departamento de Investigaciones en Láseres y Aplicaciones (CITEDEF), UNIDEF - CONICET, Argentina
Palabras clave:Decoy State; Open Air Communications; Quantum Key Distribution
Página de inicio:187
Página de fin:192
Título revista:Optica Pura y Aplicada
Título revista abreviado:Opt. Pura. Apl.


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---------- APA ----------
Magnoni, A.G., Grande, I.H.L. & Larotonda, M.A. (2017) . Free space decoy-state quantum key distribution implementation. Optica Pura y Aplicada, 50(2), 187-192.
---------- CHICAGO ----------
Magnoni, A.G., Grande, I.H.L., Larotonda, M.A. "Free space decoy-state quantum key distribution implementation" . Optica Pura y Aplicada 50, no. 2 (2017) : 187-192.
---------- MLA ----------
Magnoni, A.G., Grande, I.H.L., Larotonda, M.A. "Free space decoy-state quantum key distribution implementation" . Optica Pura y Aplicada, vol. 50, no. 2, 2017, pp. 187-192.
---------- VANCOUVER ----------
Magnoni, A.G., Grande, I.H.L., Larotonda, M.A. Free space decoy-state quantum key distribution implementation. Opt. Pura. Apl. 2017;50(2):187-192.