Universidad Complutense de Madrid
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Fast optical source for quantum key distribution based on semiconductor optical amplifiers



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Jofre, Marc y Gardelein, Arnaud y Anzolin, Gabriele y Amaya, Waldimar y Capmany Francoy, José y Ursin, Rupert y Peñate Quesada, Laura y López Molina, Demetrio y San Juan, J. L. y Carrasco, José Antonio y García de Quirós, Francisco y Torcal Milla, Francisco José y Sánchez Brea, Luis Miguel y Bernabeu Martínez, Eusebio y Perdigues Armengol, Josep Maria y Jennewein, Thomas y Pérez Torres, Juan y Mitchell, Morgan W. y Pruneri, Valerio (2011) Fast optical source for quantum key distribution based on semiconductor optical amplifiers. Optics Express, 19 (5). pp. 3825-3834. ISSN 1094-4087

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URL Oficial: http://dx.doi.org/10.1364/OE.19.003825

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A novel integrated optical source capable of emitting faint pulses with different polarization states and with different intensity levels at 100 MHz has been developed. The source relies on a single laser diode followed by four semiconductor optical amplifiers and thin film polarizers, connected through a fiber network. The use of a single laser ensures high level of indistinguishability in time and spectrum of the pulses for the four different polarizations and three different levels of intensity. The applicability of the source is demonstrated in the lab through a free space quantum key distribution experiment which makes use of the decoy state BB84 protocol. We achieved a lower bound secure key rate of the order of 3.64 Mbps and a quantum bit error ratio as low as 1.14 × 10−2 while the lower bound secure key rate became 187 bps for an equivalent attenuation of 35 dB. To our knowledge, this is the fastest polarization encoded QKD system which has been reported so far. The performance, reduced size, low power consumption and the fact that the components used can be space qualified make the source particularly suitable for secure satellite communication.

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© 2011 Optical Society of America.
This work was carried out with the financial support of the Ministerio de Educación y Ciencia (Spain) through grants TEC2007-60185, FIS2007-60179, FIS2008-01051 and Consolider Ingenio CSD2006-00019, and also by the European Space Agency under the ARTES-5 telecom programme Contract No. 21460/08/NL/IA.

Palabras clave:Optics
Materias:Ciencias > Física > Optica
Código ID:26149
Depositado:16 Jul 2014 11:49
Última Modificación:22 Jul 2014 08:36

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