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Sagnac quantum key distribution over telecom fiber networks
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2009 (English)In: Optics Communications, ISSN 0030-4018, Vol. 282, no 6, 1231-1236 p.Article in journal (Refereed) Published
Abstract [en]

We present a new concept for compensation of single mode fiber (SMF) birefringence effects in a Sagnac quantum key distribution (QKD) setup, based on a polarization control system and a polarization insensitive phase modulator. Our experimental data show stable (in regards to birefringence drift) QKD over 1550 nm SMF telecom networks in Sagnac configuration, using the BB84-protocol [C.H. Bennett, G. Brassard, in: Proceedings of the IEEE International Conference on Computers, Systems, and Signal Processing, Institute of Electrical and Electronic Engineers, New York, 1984, p. 175] with phase encoding. The achieved total Sagnac transmission loop distances were between 100 km and 150 km with quantum bit error rates (QBER) between 5.84% and 9.79% for the mean-photon-number l = 0.1. The distances were much longer and rates much higher than in any other published Sagnac QKD experiments. We also show an example of our one-decoy state protocol implementations (for the 45 km distance between Alice and Bob, corresponding to the 130 km total Sagnac loop length), providing an unconditional QKD security. The measurement results have showed feasibility of QKD over telecom fiber networks in Sagnac configuration, using standard fiber telecom components.

Place, publisher, year, edition, pages
2009. Vol. 282, no 6, 1231-1236 p.
URN: urn:nbn:se:su:diva-26537DOI: 10.1016/j.optcom.2008.12.023ISI: 000263635100032OAI: diva2:210385
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2009-04-02Bibliographically approved
In thesis
1. Experimental multiuser secure quantum communications
Open this publication in new window or tab >>Experimental multiuser secure quantum communications
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

We are currently experiencing a rapid development of quantum information, a new branch of science, being an interdisciplinary of quantum physics, information theory, telecommunications, computer science, and many others. This new science branch was born in the middle of the eighties, developed rapidly during the nineties, and in the current decade has brought a technological breakthrough in creating secure quantum key distribution (QKD), quantum secret sharing, and exciting promises in diverse technological fields. Recent QKD experiments have achieved high rate QKD at 200 km distance in optical fiber. Significant QKD results have also been achieved in free-space.

Due to the rapid broadband access deployment in many industrialized countries and the standing increasing transmission security treats, the natural development awaiting quantum communications, being a part of quantum information, is its migration into commercial switched telecom networks. Such a migration concerns both multiuser quantum key distribution and multiparty quantum secret sharing that have been the main goal of my PhD studies. They are also the main concern of the thesis.

Our research efforts in multiuser QKD has led to a development of the five-user setup for transmissions over switched fiber networks in a star and in a tree configuration. We have achieved longer secure quantum information distances and implemented more nodes than other multi-user QKD experiments. The measurements have shown feasibility of multiuser QKD over switched fiber networks, using standard fiber telecom components.

Since circular architecture networks are important parts of both intranets and the Internet, Sagnac QKD has also been a subject of our research efforts. The published experiments in this area have been very few and results were not encouraging, mainly due to the single mode fiber (SMF) birefringence. Our research has led to a development of a computer controlled birefringence compensation in Sagnac that open the door to both classical and quantum Sagnac applications. On the quantum secret sharing side, we have achieved the first quantum secret sharing experiment over telecom fiber in a five-party implementation using the "plug & play" setup and in a four-party implementation using Sagnac configuration. The setup measurements have shown feasibility and scalability of multiparty quantum communication over commercial telecom fiber networks.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2009. 110 p.
Quantum key distribution, multiparty quantum secret sharing, Sagnac interferometer, “plug & play” QKD, Passive Optical Network (PON), decoy states, single mode fiber birefringence compensation, quantum bit error rate, visibility
National Category
Physical Sciences
Research subject
urn:nbn:se:su:diva-26498 (URN)978-91-7155-846-6 (ISBN)
Public defence
2009-04-27, AlbaNova FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Available from: 2009-04-06 Created: 2009-03-30 Last updated: 2009-04-01Bibliographically approved

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Bogdanski, JanBourennane, Mohamed
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