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2. Long term performance of the SwissQuantum quantum key distribution network in a field environment

Author

Stucki, D., Legre, M., Buntschu, F., Clausen, B., Felber, N., Gisin, N., Henzen, L., Junod, P., Litzistorf, G., Monbaron, P., Monat, L., Page, J. -B., Perroud, D., Ribordy, G., Rochas, A., Robyr, S., Tavares, J., Thew, R., Trinkler, P., Ventura, S., Voirol, R., Walenta, N., and Zbinden, H.

Subjects
Quantum Physics
Abstract

In this paper, we report on the performance of the SwissQuantum quantum key distribution (QKD) network. The network was installed in the Geneva metropolitan area and run for more than one and a half years, from the end of March 2009 to the beginning of January 2011. The main goal of this experiment was to test the reliability of the quantum layer over a long period of time in a production environment. A key management layer has been developed to manage the key between the three nodes of the network. This QKD-secure network was used by end-users through an application layer., Comment: Published in New Journal of Physics, http://stacks.iop.org/1367-2630/13/123001

Published
2012
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3. Field test of quantum key distribution in the Tokyo QKD Network

Author

Sasaki, M., Fujiwara, M., Ishizuka, H., Klaus, W., Wakui, K., Takeoka, M., Tanaka, A., Yoshino, K., Nambu, Y., Takahashi, S., Tajima, A., Tomita, A., Domeki, T., Hasegawa, T., Sakai, Y., Kobayashi, H., Asai, T., Shimizu, K., Tokura, T., Tsurumaru, T., Matsui, M., Honjo, T., Tamaki, K., Takesue, H., Tokura, Y., Dynes, J. F., Dixon, A. R., Sharpe, A. W., Yuan, Z. L., Shields, A. J., Uchikoga, S., Legre, M., Robyr, S., Trinkler, P., Monat, L., Page, J. -B., Ribordy, G., Poppe, A., Allacher, A., Maurhart, O., Langer, T., Peev, M., and Zeilinger, A.

Subjects
Quantum Physics
Abstract

A novel secure communication network with quantum key distribution in a metropolitan area is reported. Different QKD schemes are integrated to demonstrate secure TV conferencing over a distance of 45km, stable long-term operation, and application to secure mobile phones., Comment: 21 pages, 19 figures

Published
2011
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4. SiPM used as fast Photon-Counting Module and for Multiphoton Detection

Author

Eraerds, P., Legre, M., Rochas, A., Zbinden, H., and Gisin, N.

Subjects
Quantum Physics, Astrophysics, Physics - Biological Physics, Physics - Instrumentation and Detectors
Abstract

We demonstrate fast counting and multiphoton detection abilities of a Silicon Photo Multiplier (SiPM). In fast counting mode we are able to detect two consecutive photons separated by only 2.3 ns corresponding to 430 MHz. The counting efficiency for small optical intensities at a wavelength of 532 nm was found to be around 8.3% with a dark count rate of 50 kHz at T=-7 degrees Celsius. Using the SiPM in multiphoton detection mode, we find a good signal discrimination for different numbers of simultaneous detected photons., Comment: 11 pages, 13 figures

Published
2007
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5. Distribution of time-bin qubits over 50 km of optical fiber

Author

Marcikic, I., de Riedmatten, H., Tittel, W., Zbinden, H., Legre, M., and Gisin, N.

Subjects
Quantum Physics
Abstract

We report experimental distribution of time-bin entangled qubits over 50 km of optical fibers. Using actively stabilized preparation and measurement devices we demonstrate violation of the CHSH Bell inequality by more than 15 standard deviations without removing the detector noise. In addition we report a proof of principle experiment of quantum key distribution over 50 km of optical fibers using entangled photon., Comment: 4 pages, 4 figures

Published
2004
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6. Quantum measurement of the degree of polarization of a light beam

Author

Legre, M., Wegmuller, M., and Gisin, N.

Subjects
Quantum Physics
Abstract

We demonstrate a coherent quantum measurement for the determination of the degree of polarization (DOP). This method allows to measure the DOP in the presence of fast polarization state fluctuations, difficult to achieve with the typically used polarimetric technique. A good precision of the DOP measurements is obtained using 8 type II nonlinear crystals assembled for spatial walk-off compensation., Comment: 4 pages, 3 figures

Published
2003
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16. A fast and versatile quantum key distribution system with hardware key distillation and wavelength multiplexing

Author

Walenta, N, primary, Burg, A, additional, Caselunghe, D, additional, Constantin, J, additional, Gisin, N, additional, Guinnard, O, additional, Houlmann, R, additional, Junod, P, additional, Korzh, B, additional, Kulesza, N, additional, Legré, M, additional, Lim, C W, additional, Lunghi, T, additional, Monat, L, additional, Portmann, C, additional, Soucarros, M, additional, Thew, R T, additional, Trinkler, P, additional, Trolliet, G, additional, Vannel, F, additional, and Zbinden, H, additional

Published
2014
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18. Long-term performance of the SwissQuantum quantum key distribution network in a field environment

Author

Stucki, D, primary, Legré, M, additional, Buntschu, F, additional, Clausen, B, additional, Felber, N, additional, Gisin, N, additional, Henzen, L, additional, Junod, P, additional, Litzistorf, G, additional, Monbaron, P, additional, Monat, L, additional, Page, J-B, additional, Perroud, D, additional, Ribordy, G, additional, Rochas, A, additional, Robyr, S, additional, Tavares, J, additional, Thew, R, additional, Trinkler, P, additional, Ventura, S, additional, Voirol, R, additional, Walenta, N, additional, and Zbinden, H, additional

Published
2011
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19. Field test of quantum key distribution in the Tokyo QKD Network

Author

Sasaki, M., primary, Fujiwara, M., additional, Ishizuka, H., additional, Klaus, W., additional, Wakui, K., additional, Takeoka, M., additional, Miki, S., additional, Yamashita, T., additional, Wang, Z., additional, Tanaka, A., additional, Yoshino, K., additional, Nambu, Y., additional, Takahashi, S., additional, Tajima, A., additional, Tomita, A., additional, Domeki, T., additional, Hasegawa, T., additional, Sakai, Y., additional, Kobayashi, H., additional, Asai, T., additional, Shimizu, K., additional, Tokura, T., additional, Tsurumaru, T., additional, Matsui, M., additional, Honjo, T., additional, Tamaki, K., additional, Takesue, H., additional, Tokura, Y., additional, Dynes, J. F., additional, Dixon, A. R., additional, Sharpe, A. W., additional, Yuan, Z. L., additional, Shields, A. J., additional, Uchikoga, S., additional, Legré, M., additional, Robyr, S., additional, Trinkler, P., additional, Monat, L., additional, Page, J.-B., additional, Ribordy, G., additional, Poppe, A., additional, Allacher, A., additional, Maurhart, O., additional, Länger, T., additional, Peev, M., additional, and Zeilinger, A., additional

Published
2011
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21. The SECOQC quantum key distribution network in Vienna

Author

Peev, M, primary, Pacher, C, additional, Alléaume, R, additional, Barreiro, C, additional, Bouda, J, additional, Boxleitner, W, additional, Debuisschert, T, additional, Diamanti, E, additional, Dianati, M, additional, Dynes, J F, additional, Fasel, S, additional, Fossier, S, additional, Fürst, M, additional, Gautier, J-D, additional, Gay, O, additional, Gisin, N, additional, Grangier, P, additional, Happe, A, additional, Hasani, Y, additional, Hentschel, M, additional, Hübel, H, additional, Humer, G, additional, Länger, T, additional, Legré, M, additional, Lieger, R, additional, Lodewyck, J, additional, Lorünser, T, additional, Lütkenhaus, N, additional, Marhold, A, additional, Matyus, T, additional, Maurhart, O, additional, Monat, L, additional, Nauerth, S, additional, Page, J-B, additional, Poppe, A, additional, Querasser, E, additional, Ribordy, G, additional, Robyr, S, additional, Salvail, L, additional, Sharpe, A W, additional, Shields, A J, additional, Stucki, D, additional, Suda, M, additional, Tamas, C, additional, Themel, T, additional, Thew, R T, additional, Thoma, Y, additional, Treiber, A, additional, Trinkler, P, additional, Tualle-Brouri, R, additional, Vannel, F, additional, Walenta, N, additional, Weier, H, additional, Weinfurter, H, additional, Wimberger, I, additional, Yuan, Z L, additional, Zbinden, H, additional, and Zeilinger, A, additional

Published
2009
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26. Experimental plug and play quantum coin flipping.

Author

Pappa A, Jouguet P, Lawson T, Chailloux A, Legré M, Trinkler P, Kerenidis I, and Diamanti E

Abstract

Performing complex cryptographic tasks will be an essential element in future quantum communication networks. These tasks are based on a handful of fundamental primitives, such as coin flipping, where two distrustful parties wish to agree on a randomly generated bit. Although it is known that quantum versions of these primitives can offer information-theoretic security advantages with respect to classical protocols, a demonstration of such an advantage in a practical communication scenario has remained elusive. Here we experimentally implement a quantum coin flipping protocol that performs strictly better than classically possible over a distance suitable for communication over metropolitan area optical networks. The implementation is based on a practical plug and play system, developed by significantly enhancing a commercial quantum key distribution device. Moreover, we provide combined quantum coin flipping protocols that are almost perfectly secure against bounded adversaries. Our results offer a useful toolbox for future secure quantum communications.

Published
2014
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27. High resolution optical time domain reflectometer based on 1.55mum up-conversion photon-counting module.

Author

Legré M, Thew R, Zbinden H, and Gisin N

Abstract

We implement a photon-counting Optical Time Domain Reflectometer (OTDR) at 1.55mum which exhibits a high 2-point resolution and a high accuracy. It is based on a low temporal-jitter photon-counting module at 1.55mum. This detector is composed of a periodically poled Lithium niobate (PPLN) waveguide, which provides a wavelength conversion from near infrared to visible light, and a low jitter silicon photon-counting detector. With this apparatus, we obtain centimetre resolution over a measurement range of tens of kilometres.

Published
2007
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28. Experimental investigation of the polarization properties of a hollow core photonic bandgap fiber for 1550 nm.

Author

Wegmuller M, Legré M, Gisin N, Hansen T, Jakobsen C, and Broeng J

Abstract

The properties of a hollow core photonic bandgap fiber designed for 1.55 um transmission are investigated with special emphasis on polarization issues. Large and strongly wavelength dependent phase and group delays are found. At the same time the principle states of polarization move strongly and erratically as a function of wavelength, leading to strong mode coupling. Wavelength regions with high polarization dependent loss coincide with depolarization due to a polarization dependent coupling to surface modes at these wavelengths.

Published
2005
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29. Experimental study of polarization properties of highly birefringent photonic crystal fibers.

Author

Ritari T, Ludvigsen H, Wegmuller M, Legré M, Gisin N, Folkenberg J, and Nielsen M

Abstract

We analyze experimentally the polarization properties of highly nonlinear small-core photonic crystal fibers (PCFs) with no intentional birefringence. The properties of recently emerged polarization maintaining PANDA PCFs are also investigated. The wavelength and temperature dependence of phase and group delay of these fibers are examined in the telecommunications wavelength range. Compared to a standard PANDA fiber, the polarization characteristics and temperature dependence are found to be qualitatively different for both types of fibers.

Published
2004
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