Dual-mode Time-bin Coding for Quantum Key Distribution Using Dual-drive Mach-Zehnder Modulator

Conference: ECOC 2007 - 33rd European Conference and Exhibition of Optical Communication
09/16/2007 - 09/20/2007 at Berlin, Germany

Proceedings: ECOC 2007

Pages: 2Language: englishTyp: PDF

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Yoshino, K.; Nambu, Y. (Nano Electronics Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki, 305-8501, Japan)
Tanaka, A.; Tajima, A. (System Platforms Research Laboratories, NEC Corporation)
Tomita, A.; Tomita, A. (Quantum Computation and Information Project, JST ERATO-SORST)

We propose and demonstrate a new method of coding for quantum key distribution using a commercial dual-drive Mach-Zehnder modulator. This method allows the user to switch between two coding modes merely by changing the driving sequence of the modulator. We obtained error rates (0.7%) sufficiently low for practical use.