Monday, 19 September, 2011
14:30 – 16:15
Room B

Mo.1.B • Spectral Efficiency And Quantum Effects

Chair: Moshe Nazarathy; Technion, Israel
 
Mo.1.B.1 • 14:30 (Tutorial)
FASTER-THAN-NYQUIST AND BEYOND: HOW TO IMPROVE SPECTRAL EFFICIENCY BY ACCEPTING INTERFERENCE
Giulio Colavolpe1
1Information Engineering, University of Parma, Italy.
Shannon theory explains that orthogonal signaling with Gaussian inputs achieves capacity on the bandlimited AWGN channel. Hence, for many years, communication systems for quasi-static channels have been designed based on orthogonal signaling. However, when low-order constellations are used, performance can be considerably improved by giving up the orthogonality, thus accepting interference. Faster-than-Nyquist signaling is an example of this paradigm. We describe a new information-theoretic approach to the more general technique of time-frequency packing and we show how it translates into practical design rules.
 
 
Mo.1.B.2 • 15:30 (Invited)
TRANSMISSION OF POLARIZATION ENTANGLED PHOTONS IN FIBER-OPTICS NETWORKS
Misha Brodsky1, Cristian Antonelli2, Mark Shtaif3
1ATT Research Labs., USA; 2Università dell'Aquila, Italy; 3Tel Aviv University, Israel.
Distribution of polarization-entangled photon pairs to remote users changes the degree of their entanglement in captivating ways. We will describe bounds to the reach of potential entanglement-based quantum cryptography systems arising from Polarization Mode Dispersion.
 
Mo.1.B.3 • 16:00
A SCALABLE FULL QUANTUM KEY DISTRIBUTION SYSTEM BASED ON COLOURLESS INTERFEROMETRIC TECHNIQUE AND HARDWARE KEY DISTILLATION
Akihiro Tanaka1, Mikio Fujiwara2, Ken-ichiro Yoshino3, Seigo Takahashi1, Yoshihiro Nambu3, Akihisa Tomita4, Shigehito Miki5, Taro Yamashita5, Zhen Wang5, Masahide Sasaki2, Akio Tajima1; 1System Platforms Research Laboratories, NEC corporation, Japan; 2Quantum ICT Laboratory, National Institute of Information and Communications Technology, Japan; 3Green Innovations Research Laboratories, NEC Corporation, Japan; 4Graduate School of Information Science and Technology, Hokkaido University, Japan; 5Nano ICT Laboratory, National Institute of Information and Communications Technology, Japan.
 A scalable full QKD system using WDM and key distillation HW engine was developed. The three-channel multiplexed system achieved the world summit level key generation rate of higher than 200 kbps with 14.5-dB transmission loss.

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