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Proceedings Paper

Demonstration of secure quantum key distribution
Author(s): Fabio Antonio Bovino; Pietro Varisco; Anna Martinoli; Paolo De Nicolo; Sandra Bruzzo; Anna Maria Colla; Giuseppe Castagnoli; Giovanni Di Giuseppe; Alexander V. Sergienko
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Paper Abstract

We present results of experimental demonstration of secure Quantum Key Distribution (QKD) at Elsag spa based on the implementation of BB84 protocol using polarization entangled states produced in the nonlinear process of type-II spontaneous parametric down conversion (SPDC). This enables us to avoid the use of active polarization modulation components and increases the overall key distribution rate. The high quality of polarization-entangled state generated by parametric down conversion and the high efficiency of coupling entangled-photon pairs into a single-mode optical fiber has enabled us to perform QKD with quantum bit-error rate compatible with acceptable security levels. The complete software system architecture includes a QKD protocol implementing all phases of the key distillation process. The system runs in a server and two users configuration on three different PCs connected over a local area network (LAN). Friendly graphical user interfaces (GUI) are available to start and to monitor the whole key generation and distillation process.

Paper Details

Date Published: 4 August 2003
PDF: 10 pages
Proc. SPIE 5105, Quantum Information and Computation, (4 August 2003); doi: 10.1117/12.487942
Show Author Affiliations
Fabio Antonio Bovino, Elsag SpA (Italy)
Pietro Varisco, Elsag SpA (Italy)
Anna Martinoli, Elsag SpA (Italy)
Paolo De Nicolo, Elsag SpA (Italy)
Sandra Bruzzo, Elsag SpA (Italy)
Anna Maria Colla, Elsag SpA (Italy)
Giuseppe Castagnoli, Elsag SpA (Italy)
Giovanni Di Giuseppe, Boston Univ. (United States)
Istituto Elettrotecnico Nazionale G. Ferrais (Italy)
Alexander V. Sergienko, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 5105:
Quantum Information and Computation
Eric Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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