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Proceedings Paper

Sagnac quantum key distribution and secret sharing
Author(s): Jan Bogdanski; Johan Ahrens; Mohamed Bourennane
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Paper Abstract

We present the first Sagnac quantum secret sharing (in three- and four-party implementations) as well as Sagnac two-user quantum key distribution (QKD) over 1550 nm single mode fiber (SMF) networks, using the BB84- protocol with phase encoding. The secret sharing experiment has implemented a single qubit protocol, which allows for a practical secret sharing implementation over fiber telecom channels and in free-space. The previous quantum secret sharing proposals were based on multiparticle entangled states, not scalable and diffcult in the experimental implementations. Our experimental data show stable, in regards to birefringence drift, quantum secret sharing transmissions at the total Sagnac transmission loop distances of 45-55 km with the quantum bit error rates (QBER) of 3.0-3.7 % for the mean photon number μ = 0.1. In the QKD experiment we have achieved the total Sagnac transmission loop distances of 100-150 km with quantum bit error rates (QBER) of 5.84-9.79 % for μ = 0.1. The distances were much longer and rates much higher than in any other published Sagnac QKD experiments. The stability of quantum transmission in both secret sharing and QKD experiments has been achieved thanks to our new concept for compensation of SMF birefringence effects in Sagnac, based on a polarization control system and a polarization insensitive phase modulator. The measurement results have showed feasibility of quantum secret sharing and QKD over telecom fiber networks in Sagnac confi;guration, using standard fiber telecom components. Our birefringence compensation in SMF Sagnac open the door to other Sagnac-based applications over SMF links such as precise optical sensing, dispersion characteristics of optical fibers, acoustic and strain sensing, and generally sensing of any time varying phenomenon.

Paper Details

Date Published: 26 January 2009
PDF: 8 pages
Proc. SPIE 7236, Quantum Communications Realized II, 72360M (26 January 2009); doi: 10.1117/12.819158
Show Author Affiliations
Jan Bogdanski, Stockholm Univ. (Sweden)
Johan Ahrens, Stockholm Univ. (Sweden)
Mohamed Bourennane, Stockholm Univ. (Sweden)

Published in SPIE Proceedings Vol. 7236:
Quantum Communications Realized II
Yasuhiko Arakawa; Masahide Sasaki; Hideyuki Sotobayashi, Editor(s)

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