Fast optical source for quantum key distribution based on semiconductor optical amplifiers



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Jofre, Marc and Gardelein, Arnaud and Anzolin, Gabriele and Amaya, Waldimar and Capmany Francoy, José and Ursin, Rupert and Peñate Quesada, Laura and López Molina, Demetrio and San Juan, J. L. and Carrasco, José Antonio and García de Quirós, Francisco and Torcal Milla, Francisco José and Sánchez Brea, Luis Miguel and Bernabeu Martínez, Eusebio and Perdigues Armengol, Josep Maria and Jennewein, Thomas and Pérez Torres, Juan and Mitchell, Morgan W. and 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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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.

Uncontrolled Keywords:Optics
Subjects:Sciences > Physics > Optics
ID Code:26149
Deposited On:16 Jul 2014 11:49
Last Modified:22 Jul 2014 08:36

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